| rooftree | (noun) a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters | Synonyms: ridge, ridgepole |
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| roofy | (noun) street names for flunitrazepam | Synonyms: circle, forget me drug, Mexican valium, R-2, roach, rope, rophy |
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| rooibos | (noun) South African shrub having flat acuminate leaves and yellow flowers; leaves are aromatic when dried and used to make an herbal tea | Synonyms: Aspalathus cedcarbergensis, Aspalathus linearis |
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| rook | (noun) common gregarious Old World bird about the size and color of the American crow | Synonyms: Corvus frugilegus |
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| (noun) (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard | Synonyms: castle |
| rookery | (noun) a breeding ground for gregarious birds (such as rooks) | - |
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| rookie | (noun) an awkward and inexperienced youth | Synonyms: cub, greenhorn |
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| room | (noun) an area within a building enclosed by walls and floor and ceiling | - |
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| (noun) the people who are present in a room | - |
| (noun) space for movement | Synonyms: elbow room, way |
| (noun) opportunity for | - |
| roomer | (noun) a tenant in someone's house | Synonyms: boarder, lodger |
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| roomette | (noun) a small private compartment for one on a sleeping car | - |
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| roomful | (noun) the quantity a room will hold | - |
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| roomie | (noun) an associate who shares a room with you | Synonyms: roommate, roomy |
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| roominess | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, commodiousness, spaciousness |
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| (noun) intellectual breadth | Synonyms: capaciousness |
| roommate | (noun) an associate who shares a room with you | Synonyms: roomie, roomy |
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| rooms | (noun) apartment consisting of a series of connected rooms used as a living unit (as in a hotel) | Synonyms: suite |
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| roomy | (noun) an associate who shares a room with you | Synonyms: roomie, roommate |
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| roost | (noun) a perch on which domestic fowl rest or sleep | - |
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| (noun) a shelter with perches for fowl or other birds | - |
| rooster | (noun) adult male chicken | Synonyms: cock |
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| root | (noun) the embedded part of a bodily structure such as a tooth, nail, or hair | - |
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| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, radical, root word, stem, theme |
| (noun) a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes | Synonyms: etymon |
| (noun) the set of values that give a true statement when substituted into an equation | Synonyms: solution |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, rootage, source |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, ascendent |
| (noun) (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground | - |
| (noun) a number that, when multiplied by itself some number of times, equals a given number | - |
| rootage | (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, root, source |
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| (noun) a developed system of roots | Synonyms: root system |
| (noun) fixedness by or as if by roots | - |
| rooter | (noun) an enthusiastic devotee of sports | Synonyms: fan, sports fan |
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| rooting | (noun) the process of putting forth roots and beginning to grow | - |
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| rootlet | (noun) small root or division of a root | - |
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| roots | (noun) the condition of belonging to a particular place or group by virtue of social or ethnic or cultural lineage | - |
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| rootstalk | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rhizome, rootstock |
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| rootstock | (noun) root or part of a root used for plant propagation; especially that part of a grafted plant that supplies the roots | - |
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| (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rhizome, rootstalk |
| rope | (noun) a strong line | - |
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| (noun) street names for flunitrazepam | Synonyms: circle, forget me drug, Mexican valium, R-2, roach, roofy, rophy |
| ropebark | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, leatherwood, moose-wood, moosewood, wicopy |
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| ropedancer | (noun) an acrobat who performs on a rope stretched at some height above the ground | Synonyms: ropewalker |
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| ropemaker | (noun) a craftsman who makes ropes | Synonyms: rope-maker, roper |
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| roper | (noun) a craftsman who makes ropes | Synonyms: rope-maker, ropemaker |
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| (noun) a cowboy who uses a lasso to rope cattle or horses | - |
| (noun) a decoy who lures customers into a gambling establishment (especially one with a fixed game) | - |
| ropewalk | (noun) workplace consisting of a long narrow path or shed where rope is made | Synonyms: rope yard |
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| ropewalker | (noun) an acrobat who performs on a rope stretched at some height above the ground | Synonyms: ropedancer |
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| ropeway | (noun) a conveyance that transports passengers or freight in carriers suspended from cables and supported by a series of towers | Synonyms: aerial tramway, cable tramway, tram, tramway |
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| rophy | (noun) street names for flunitrazepam | Synonyms: circle, forget me drug, Mexican valium, R-2, roach, roofy, rope |
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| ropiness | (noun) the property of being cohesive and sticky | Synonyms: cohesiveness, glueyness, gluiness, gumminess, tackiness, viscidity, viscidness |
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| roping | (noun) capturing cattle or horses with a lasso | - |
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| roquette | (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: arugula, Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket, rocket salad |
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| roridula | (noun) either of 2 species of the genus Roridula; South African viscid perennial low-growing woody shrubs | - |
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| rorqual | (noun) any of several baleen whales of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal fin | Synonyms: razorback |
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| rosacea | (noun) a skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearance | Synonyms: acne rosacea |
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| rosary | (noun) a string of beads used in counting prayers (especially by Catholics) | Synonyms: prayer beads |
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| rose | (noun) a dusty pink color | Synonyms: rosiness |
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| (noun) pinkish table wine from red grapes whose skins were removed after fermentation began | Synonyms: blush wine, pink wine, rose wine |
| (noun) any of many shrubs of the genus Rosa that bear roses | Synonyms: rosebush |
| rosebay | (noun) late-spring-blooming rhododendron of eastern North America having rosy to pink-purple flowers | Synonyms: Rhododendron maxima |
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| rosebud | (noun) (a literary reference to) a pretty young girl | - |
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| (noun) the bud of a rose | - |
| rosebush | (noun) any of many shrubs of the genus Rosa that bear roses | Synonyms: rose |
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| rosefish | (noun) large fish of northern Atlantic coasts of America and Europe | Synonyms: ocean perch, Sebastes marinus |
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| (noun) North Atlantic rockfish | Synonyms: ocean perch, redfish |
| rosehip | (noun) the fruit of a rose plant | Synonyms: hip, rose hip |
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| roselle | (noun) East Indian sparsely prickly annual herb or perennial subshrub widely cultivated for its fleshy calyxes used in tarts and jelly and for its bast fiber | Synonyms: Hibiscus sabdariffa, Jamaica sorrel, red sorrel, rozelle, sorrel |
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| rosemaling | (noun) a Scandinavian style of carved or painted decoration (as on furniture or walls or dinnerware) consisting of floral motifs | - |
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| rosemary | (noun) extremely pungent leaves used fresh or dried as seasoning for especially meats | - |
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| (noun) widely cultivated for its fragrant grey-green leaves used in cooking and in perfumery | Synonyms: Rosmarinus officinalis |
| roseola | (noun) any red eruption of the skin | Synonyms: efflorescence, rash, skin rash |
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| rosette | (noun) an ornament or pattern resembling a rose that is worn as a badge of office or as recognition of having won an honor | - |
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| (noun) circular window filled with tracery | Synonyms: rose window |
| (noun) a cluster of leaves growing in crowded circles from a common center or crown (usually at or close to the ground) | - |
| (noun) rhizoctinia disease of potatoes | Synonyms: little potato, russet scab, stem canker |
| rosewood | (noun) any of those hardwood trees of the genus Dalbergia that yield rosewood--valuable cabinet woods of a dark red or purplish color streaked and variegated with black | Synonyms: rosewood tree |
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| (noun) hard dark reddish wood of a rosewood tree having a strongly marked grain; used in cabinetwork | - |
| rosilla | (noun) a sneezeweed of southwestern United States especially southern California | Synonyms: Helenium puberulum |
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| rosin | (noun) any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules | Synonyms: resin |
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| rosiness | (noun) a healthy reddish complexion | Synonyms: ruddiness |
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| (noun) a dusty pink color | Synonyms: rose |
| (noun) a rosy color (especially in the cheeks) taken as a sign of good health | Synonyms: bloom, blush, flush |
| rosinweed | (noun) North American perennial having a resinous odor and yellow flowers | Synonyms: Silphium laciniatum |
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| (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, gumweed, tarweed |
| rosita | (noun) erect plant with small clusters of pink trumpet-shaped flowers of southwestern United States | Synonyms: Centaurium calycosum |
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| roster | (noun) a list of names | Synonyms: roll |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| rot | (noun) unacceptable behavior (especially ludicrously false statements) | Synonyms: buncombe, bunk, bunkum, guff, hogwash |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, putrefaction, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: putrefaction |
| rota | (noun) a roster of names showing the order in which people should perform certain duties | - |
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| rotary | (noun) a road junction at which traffic streams circularly around a central island | Synonyms: circle, roundabout, traffic circle |
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| (noun) electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa | Synonyms: rotary converter, synchronous converter |
| rotation | (noun) the act of rotating as if on an axis | Synonyms: rotary motion |
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| (noun) a planned recurrent sequence (of crops or personnel etc.) | - |
| (noun) a single complete turn (axial or orbital) | Synonyms: gyration, revolution |
| (noun) (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin | - |
| rotavirus | (noun) the reovirus causing infant enteritis | - |
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| rote | (noun) memorization by repetition | Synonyms: rote learning |
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| rotenone | (noun) a white crystalline insecticide that has low toxicity for mammals; is used in home gardens; extracted from the roots of derris and cube | - |
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| rotgut | (noun) any alcoholic beverage of inferior quality | - |
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| rotifer | (noun) minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion; constituents of freshwater plankton | - |
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| rotisserie | (noun) a restaurant that specializes in roasted and barbecued meats | - |
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| (noun) an oven or broiler equipped with a rotating spit on which meat cooks as it turns | - |
| rotl | (noun) a unit of weight used in some Muslim countries near the Mediterranean; varies between one and five pounds | - |
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| rotogravure | (noun) using photography to produce a plate for printing | Synonyms: photogravure |
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| (noun) printing by transferring an image from a photogravure plate to a cylinder in a rotary press | - |
| (noun) printed material (text and pictures) produced by an intaglio printing process in a rotary press | - |
| rotor | (noun) rotating mechanism consisting of an assembly of rotating airfoils | - |
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| (noun) the rotating armature of a motor or generator | Synonyms: rotor coil |
| (noun) the revolving bar of a distributor | - |
| rottenness | (noun) the quality of rotting and becoming putrid | Synonyms: putrescence |
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| (noun) in a state of progressive putrefaction | Synonyms: corruption, putrescence, putridness |
| rottenstone | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: tripoli |
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| rotter | (noun) a person who is deemed to be despicable or contemptible | Synonyms: bum, crumb, dirty dog, git, lowlife, puke, rat, scum bag, scumbag, skunk, so-and-so, stinker, stinkpot |
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| rotting | (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, putrefaction, rot |
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| rotunda | (noun) a large circular room | - |
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| (noun) a building having a circular plan and a dome | - |
| rotundity | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundness, sphericalness, sphericity |
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| (noun) the fullness of a tone of voice | Synonyms: roundness |
| rotundness | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundity, sphericalness, sphericity |
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| rouble | (noun) the basic unit of money in Russia | Synonyms: ruble |
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| roue | (noun) a dissolute man in fashionable society | Synonyms: blood, profligate, rake, rakehell, rip |
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| rouge | (noun) makeup consisting of a pink or red powder applied to the cheeks | Synonyms: blush, blusher, paint |
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| rougeberry | (noun) bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas | Synonyms: blood berry, bloodberry, Rivina humilis, rouge plant |
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| rough | (noun) the part of a golf course bordering the fairway where the grass is not cut short | - |
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| roughage | (noun) coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis | Synonyms: fiber, fibre |
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| roughcast | (noun) a rough preliminary model | - |
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| (noun) a coarse plaster for the surface of external walls | - |
| roughleg | (noun) large hawk of the Northern Hemisphere that feeds chiefly on small rodents and is beneficial to farmers | Synonyms: Buteo lagopus, rough-legged hawk |
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| roughneck | (noun) a cruel and brutal fellow | Synonyms: bully, hooligan, rowdy, ruffian, tough, yob, yobbo, yobo |
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| roughness | (noun) harsh or severe speech or behavior | - |
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| (noun) a texture of a surface or edge that is not smooth but is irregular and uneven | Synonyms: raggedness |
| (noun) the quality of being harsh or rough or grating to the senses | Synonyms: harshness |
| (noun) an unpolished unrefined quality | Synonyms: crudeness |
| (noun) the formation of small pits in a surface as a consequence of corrosion | Synonyms: indentation, pitting |
| (noun) used of the sea during inclement or stormy weather | Synonyms: choppiness, rough water |
| (noun) rowdy behavior | Synonyms: disorderliness, rowdiness, rowdyism |
| roughrider | (noun) a horseman skilled at breaking wild horses to the saddle | - |
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| roulade | (noun) (music) an elaborate run of several notes sung to one syllable | - |
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| (noun) a dish consisting of a slice of meat that is rolled around a filling and cooked | - |
| rouleau | (noun) a roll of coins wrapped in paper | - |
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| (noun) a roll of ribbon | - |
| roulette | (noun) a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in | - |
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| (noun) a wheel with teeth for making a row of perforations | Synonyms: toothed wheel |
| (noun) a line generated by a point on one figure rolling around a second figure | Synonyms: line roulette |
| round | (noun) (often plural) a series of professional calls (usually in a set order) | - |
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| (noun) the usual activities in your day | Synonyms: daily round |
| (noun) the activity of playing 18 holes of golf | Synonyms: round of golf |
| (noun) any circular or rotating mechanism | Synonyms: circle |
| (noun) a charge of ammunition for a single shot | Synonyms: one shot, unit of ammunition |
| (noun) a crosspiece between the legs of a chair | Synonyms: rung, stave |
| (noun) a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time | Synonyms: troll |
| (noun) an outburst of applause | - |
| (noun) a cut of beef between the rump and the lower leg | - |
| (noun) a serving to each of a group (usually alcoholic) | Synonyms: round of drinks |
| (noun) a regular route for a sentry or policeman | Synonyms: beat |
| (noun) the course along which communications spread | - |
| (noun) (sports) a division of a game during which one team is on the offensive | Synonyms: bout, turn |
| (noun) an interval during which a recurring sequence of events occurs | Synonyms: cycle, rhythm |
| roundabout | (noun) a road junction at which traffic streams circularly around a central island | Synonyms: circle, rotary, traffic circle |
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| (noun) a large, rotating machine with seats for children to ride on for amusement | Synonyms: carousel, carrousel, merry-go-round, whirligig |
| roundedness | (noun) the property possessed by a rounded convexity | Synonyms: bulginess |
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| roundel | (noun) round piece of armor plate that protects the armpit | - |
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| (noun) (heraldry) a charge in the shape of a filled circle | - |
| (noun) English form of rondeau having three triplets with a refrain after the first and third | - |
| roundelay | (noun) a song in which a line or phrase is repeated as the refrain | - |
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| rounder | (noun) a tool for rounding corners or edges | - |
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| (noun) a dissolute person; usually a man who is morally unrestrained | Synonyms: debauchee, libertine |