| pyridoxal | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxamine, pyridoxine, vitamin B6 |
|---|
| pyrogallol | (noun) a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer | Synonyms: pyrogallic acid |
|---|
| quadrilateral | (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
|---|
| quail | (noun) small gallinaceous game birds | - |
|---|
| (noun) flesh of quail; suitable for roasting or broiling if young; otherwise must be braised | - |
| quarrel | (noun) an arrow that is shot from a crossbow; has a head with four edges | - |
|---|
| (noun) an angry dispute | Synonyms: dustup, row, run-in, words, wrangle |
| quarterfinal | (noun) one of the four competitions in an elimination tournament whose winners go on to play in the semifinals | - |
|---|
| quatercentennial | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentenary |
|---|
| quetzal | (noun) large trogon of Central America and South America having golden-green and scarlet plumage | Synonyms: quetzal bird |
|---|
| (noun) the basic unit of money in Guatemala; equal to 100 centavos | - |
| quill | (noun) a stiff hollow protective spine on a porcupine or hedgehog | - |
|---|
| (noun) the hollow spine of a feather | Synonyms: calamus, shaft |
| (noun) any of the larger wing or tail feathers of a bird | Synonyms: flight feather, pinion, quill feather |
| (noun) pen made from a bird's feather | Synonyms: quill pen |
| quincentennial | (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentenary |
|---|
| quintal | (noun) a United States unit of weight equivalent to 100 pounds | Synonyms: cental, centner, cwt, hundredweight, short hundredweight |
|---|
| (noun) a unit of weight equal to 100 kilograms | - |
| racquetball | (noun) a game played on a handball court with short-handled rackets | - |
|---|
| (noun) the ball used in playing the game of racquetball | - |
| radial | (noun) pneumatic tire that has radial-ply casing | Synonyms: radial-ply tire, radial tire |
|---|
| radical | (noun) a character conveying the lexical meaning of a logogram | - |
|---|
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, root, root word, stem, theme |
| (noun) a person who has radical ideas or opinions | - |
| (noun) (mathematics) a quantity expressed as the root of another quantity | - |
| (noun) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule | Synonyms: chemical group, group |
| (noun) an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule | Synonyms: free radical |
| radiopharmaceutical | (noun) pharmaceutical consisting of a radioactive compound used in radiation therapy | - |
|---|
| rail | (noun) any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud | - |
|---|
| (noun) a horizontal bar (usually of wood or metal) | - |
| (noun) a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll | Synonyms: rails, runway, track |
| (noun) a barrier consisting of a horizontal bar and supports | Synonyms: railing |
| (noun) short for railway | - |
| rainfall | (noun) water falling in drops from vapor condensed in the atmosphere | Synonyms: rain |
|---|
| rakehell | (noun) a dissolute man in fashionable society | Synonyms: blood, profligate, rake, rip, roue |
|---|
| ramipril | (noun) an ACE inhibitor (trade name Altace) used to treat high blood pressure or in some patients who have had a heart attack | Synonyms: Altace |
|---|
| rappel | (noun) (mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body | Synonyms: abseil |
|---|
| rascal | (noun) one who is playfully mischievous | Synonyms: imp, monkey, rapscallion, scalawag, scallywag, scamp |
|---|
| (noun) a deceitful and unreliable scoundrel | Synonyms: knave, rapscallion, rogue, scalawag, scallywag, varlet |
| ratel | (noun) nocturnal badger-like carnivore of wooded regions of Africa and southern Asia | Synonyms: honey badger, Mellivora capensis |
|---|
| rational | (noun) an integer or a fraction | Synonyms: rational number |
|---|
| rattail | (noun) deep-sea fish with a large head and body and long tapering tail | Synonyms: grenadier, rattail fish |
|---|
| ravel | (noun) a row of unravelled stitches | Synonyms: ladder, run |
|---|
| razorbill | (noun) black-and-white northern Atlantic auk having a compressed sharp-edged bill | Synonyms: Alca torda, razor-billed auk |
|---|
| real | (noun) any rational or irrational number | Synonyms: real number |
|---|
| (noun) an old small silver Spanish coin | - |
| (noun) the basic unit of money in Brazil; equal to 100 centavos | - |
| reappraisal | (noun) a new appraisal or evaluation | Synonyms: reassessment, revaluation, review |
|---|
| rebel | (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurgent, insurrectionist |
|---|
| (noun) someone who exhibits great independence in thought and action | Synonyms: maverick |
| reburial | (noun) the act of burying again | Synonyms: reburying |
|---|
| rebuttal | (noun) the speech act of refuting by offering a contrary contention or argument | - |
|---|
| (noun) (law) a pleading by the defendant in reply to a plaintiff's surrejoinder | Synonyms: rebutter |
| recall | (noun) the act of removing an official by petition | - |
|---|
| (noun) the process of remembering (especially the process of recovering information by mental effort) | Synonyms: recollection, reminiscence |
| (noun) a call to return | - |
| (noun) a bugle call that signals troops to return | - |
| (noun) a request by the manufacturer of a defective product to return the product (as for replacement or repair) | Synonyms: callback |
| recessional | (noun) a hymn that is sung at the end of a service as the clergy and choir withdraw | - |
|---|
| (noun) the withdrawal of the clergy and choir from the chancel to the vestry at the end of a church service | Synonyms: recession |
| reciprocal | (noun) hybridization involving a pair of crosses that reverse the sexes associated with each genotype | Synonyms: reciprocal cross |
|---|
| (noun) (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7 | Synonyms: multiplicative inverse |
| (noun) something (a term or expression or concept) that has an inverse relation to something else | - |
| recital | (noun) the act of giving an account describing incidents or a course of events | Synonyms: narration, yarn |
|---|
| (noun) a public instance of reciting or repeating (from memory) something prepared in advance | Synonyms: reading, recitation |
| (noun) performance of music or dance especially by soloists | - |
| (noun) a detailed account or description of something | - |
| recoil | (noun) a movement back from an impact | Synonyms: backlash, rebound, repercussion |
|---|
| (noun) the backward jerk of a gun when it is fired | Synonyms: kick |
| recusal | (noun) (law) the disqualification of a judge or jury by reason of prejudice or conflict of interest; a judge can be recused by objections of either party or judges can disqualify themselves | Synonyms: recusation |
|---|
| redpoll | (noun) small siskin-like finch with a red crown and a rosy breast and rump | Synonyms: Carduelis flammea |
|---|
| (noun) small siskin-like finch with a red crown | Synonyms: Carduelis hornemanni |
| redtail | (noun) dark brown American hawk species having a reddish-brown tail | Synonyms: Buteo jamaicensis, red-tailed hawk |
|---|
| (noun) European songbird with a reddish breast and tail; related to Old World robins | Synonyms: redstart |
| reel | (noun) a lively dance of Scottish Highlanders; marked by circular moves and gliding steps | Synonyms: Scottish reel |
|---|
| (noun) an American country dance which starts with the couples facing each other in two lines | Synonyms: Virginia reel |
| (noun) a winder around which thread or tape or film or other flexible materials can be wound | Synonyms: bobbin, spool |
| (noun) winder consisting of a revolving spool with a handle; attached to a fishing rod | - |
| (noun) a roll of photographic film holding a series of frames to be projected by a movie projector | - |
| (noun) music composed for dancing a reel | - |
| referral | (noun) the act of referring (as forwarding an applicant for employment or referring a matter to an appropriate agency) | - |
|---|
| (noun) a recommendation to consult the (professional) person or group to whom one has been referred | - |
| (noun) a person whose case has been referred to a specialist or professional group | - |
| refill | (noun) a commercial product that refills a container with its appropriate contents | - |
|---|
| (noun) a prescription drug that is provided again | - |
| refusal | (noun) a message refusing to accept something that is offered | - |
|---|
| (noun) the act of refusing | - |
| refutal | (noun) the act of determining that something is false | Synonyms: disproof, falsification, falsifying, refutation |
|---|
| regosol | (noun) a type of soil consisting of unconsolidated material from freshly deposited alluvium or sand | - |
|---|
| rehearsal | (noun) (psychology) a form of practice; repetition of information (silently or aloud) in order to keep it in short-term memory | - |
|---|
| (noun) a practice session in preparation for a public performance (as of a play or speech or concert) | Synonyms: dry run |
| remittal | (noun) the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance | Synonyms: absolution, remission, remission of sin |
|---|
| (noun) an abatement in intensity or degree (as in the manifestations of a disease) | Synonyms: remission, subsidence |
| (noun) a payment of money sent to a person in another place | Synonyms: remission, remitment, remittance |
| removal | (noun) the act of removing | Synonyms: remotion |
|---|
| (noun) dismissal from office | - |
| renewal | (noun) the conversion of wasteland into land suitable for use of habitation or cultivation | Synonyms: reclamation, rehabilitation |
|---|
| (noun) the act of renewing | - |
| (noun) filling again by supplying what has been used up | Synonyms: refilling, replacement, replenishment |
| rental | (noun) the act of paying for the use of something (as an apartment or house or car) | Synonyms: renting |
|---|
| (noun) property that is leased or rented out or let | Synonyms: lease, letting |
| repeal | (noun) the act of abrogating; an official or legal cancellation | Synonyms: abrogation, annulment |
|---|
| reprisal | (noun) a retaliatory action against an enemy in wartime | - |
|---|
| reproval | (noun) an act or expression of criticism and censure | Synonyms: rebuke, reprehension, reprimand, reproof |
|---|
| requital | (noun) an act of requiting; returning in kind | Synonyms: payment |
|---|
| (noun) a justly deserved penalty | Synonyms: retribution |
| residual | (noun) (often plural) a payment that is made to a performer or writer or director of a television show or commercial that is paid for every repeat showing | - |
|---|
| (noun) something left after other parts have been taken away | Synonyms: balance, remainder, residue, residuum, rest |
| resorcinol | (noun) a crystalline phenol obtained from various resins; used in ointments for acne and in dandruff shampoos | - |
|---|
| retail | (noun) the selling of goods to consumers; usually in small quantities and not for resale | - |
|---|
| retinal | (noun) either of two yellow to red retinal pigments formed from rhodopsin by the action of light | Synonyms: retinene |
|---|
| retinol | (noun) an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene | Synonyms: vitamin A1 |
|---|
| retrial | (noun) a new trial in which issues already litigated and to which the court has already rendered a verdict or decision are reexamined by the same court; occurs when the initial trial is found to have been improper or unfair due to procedural errors | - |
|---|
| retrieval | (noun) the act of regaining or saving something lost (or in danger of becoming lost) | Synonyms: recovery |
|---|
| (noun) the cognitive operation of accessing information in memory | - |
| (noun) (computer science) the operation of accessing information from the computer's memory | - |
| revel | (noun) unrestrained merrymaking | Synonyms: revelry |
|---|
| reversal | (noun) a change from one state to the opposite state | - |
|---|
| (noun) the act of reversing the order or place of | Synonyms: transposition |
| (noun) turning in the opposite direction | Synonyms: reverse, reversion, turnabout, turnaround |
| (noun) a major change in attitude or principle or point of view | Synonyms: about-face, policy change, volte-face |
| (noun) a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside | - |
| (noun) a decision to reverse an earlier decision | Synonyms: change of mind, flip-flop, turnabout, turnaround |
| (noun) turning in an opposite direction or position | Synonyms: turn around |
| (noun) an unfortunate happening that hinders or impedes; something that is thwarting or frustrating | Synonyms: black eye, blow, reverse, setback |
| revisal | (noun) the act of rewriting something | Synonyms: rescript, revise, revision |
|---|
| revival | (noun) bringing again into activity and prominence | Synonyms: resurgence, revitalisation, revitalization, revivification |
|---|
| (noun) an evangelistic meeting intended to reawaken interest in religion | Synonyms: revival meeting |
| rial | (noun) the basic unit of money in Yemen; equal to 100 fils | Synonyms: Yemeni rial |
|---|
| (noun) the basic unit of money in Iran | Synonyms: Iranian rial |
| (noun) the basic unit of money in Oman | Synonyms: Omani rial, riyal-omani |
| ridgel | (noun) a colt with undescended testicles | Synonyms: ridgeling, ridgil, ridgling |
|---|
| ridgil | (noun) a colt with undescended testicles | Synonyms: ridgel, ridgeling, ridgling |
|---|
| riel | (noun) the basic unit of money in Cambodia; equal to 100 sen | - |
|---|
| rijstafel | (noun) dish originating in Indonesia; a wide variety of foods and sauces are served with rice | Synonyms: rijstaffel, rijsttaffel |
|---|
| rijstaffel | (noun) dish originating in Indonesia; a wide variety of foods and sauces are served with rice | Synonyms: rijstafel, rijsttaffel |
|---|
| rijsttaffel | (noun) dish originating in Indonesia; a wide variety of foods and sauces are served with rice | Synonyms: rijstafel, rijstaffel |
|---|
| rill | (noun) a small stream | Synonyms: rivulet, run, runnel, streamlet |
|---|
| (noun) a small channel (as one formed by soil erosion) | - |
| ringtail | (noun) an immature golden eagle | - |
|---|
| (noun) North American raccoon | Synonyms: common raccoon, common racoon, coon, Procyon lotor |
| (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomistle, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat |
| (noun) monkey of Central America and South America having thick hair on the head that resembles a monk's cowl | Synonyms: capuchin, Cebus capucinus |
| ritual | (noun) any customary observance or practice | Synonyms: rite |
|---|
| (noun) the prescribed procedure for conducting religious ceremonies | - |
| (noun) stereotyped behavior | - |
| rival | (noun) the contestant you hope to defeat | Synonyms: challenger, competition, competitor, contender |
|---|
| riyal | (noun) the basic unit of money in Qatar | Synonyms: Qatari riyal |
|---|
| (noun) the basic unit of money in Saudi Arabia | Synonyms: Saudi Arabian riyal |
| roadkill | (noun) the dead body of an animal that has been killed on a road by a vehicle | - |
|---|
| robocall | (noun) An phone call made by an automated service | - |
|---|
| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
|---|
| roll | (noun) a flight maneuver; aircraft rotates about its longitudinal axis without changing direction or losing altitude | - |
|---|
| (noun) the act of rolling something (as the ball in bowling) | Synonyms: bowl |
| (noun) the act of throwing dice | Synonyms: cast |
| (noun) walking with a swaying gait | - |
| (noun) anything rolled up in cylindrical form | - |
| (noun) photographic film rolled up inside a container to protect it from light | - |
| (noun) a list of names | Synonyms: roster |
| (noun) a document that can be rolled up (as for storage) | Synonyms: scroll |
| (noun) a deep prolonged sound (as of thunder or large bells) | Synonyms: peal, pealing, rolling |
| (noun) a long heavy sea wave as it advances towards the shore | Synonyms: roller, rolling wave |
| (noun) rotary motion of an object around its own axis | Synonyms: axial motion, axial rotation |
| (noun) the sound of a drum (especially a snare drum) beaten rapidly and continuously | Synonyms: drum roll, paradiddle |
| (noun) small rounded bread either plain or sweet | Synonyms: bun |
| (noun) a roll of currency notes (often taken as the resources of a person or business etc.) | Synonyms: bankroll |
| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: coil, curl, curlicue, gyre, ringlet, scroll, whorl |
| rondel | (noun) a French verse form of 10 or 13 lines running on two rhymes; the opening phrase is repeated as the refrain of the second and third stanzas | Synonyms: rondeau |
|---|
| roomful | (noun) the quantity a room will hold | - |
|---|
| 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 |
|---|
| rotl | (noun) a unit of weight used in some Muslim countries near the Mediterranean; varies between one and five pounds | - |
|---|
| roundel | (noun) round piece of armor plate that protects the armpit | - |
|---|
| (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 | - |
| rowel | (noun) a small spiked wheel at the end of a spur | - |
|---|
| royal | (noun) stag with antlers of 12 or more branches | Synonyms: royal stag |
|---|
| (noun) a sail set next above the topgallant on a royal mast | - |
| rubel | (noun) the basic unit of money in Belarus | - |
|---|
| runnel | (noun) a small stream | Synonyms: rill, rivulet, run, streamlet |
|---|
| sabbatical | (noun) a leave usually taken every seventh year | Synonyms: sabbatical leave |
|---|
| sackful | (noun) the quantity contained in a sack | Synonyms: sack |
|---|
| saddlebill | (noun) large black-and-white stork of tropical Africa; its red bill has a black band around the middle | Synonyms: Ephippiorhynchus senegalensis, jabiru |
|---|
| sail | (noun) an ocean trip taken for pleasure | Synonyms: cruise |
|---|
| (noun) a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel | Synonyms: canvas, canvass, sheet |
| (noun) any structure that resembles a sail | - |
| salal | (noun) small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries | Synonyms: Gaultheria shallon, shallon |
|---|
| salesgirl | (noun) a woman salesperson | Synonyms: saleslady, saleswoman |
|---|
| salol | (noun) a white powder with a pleasant taste and odor; used to absorb light in sun tan lotions or as a preservative or an antiseptic or a coating for pills in which the medicine is intended for enteric release | Synonyms: phenyl salicylate |
|---|
| samiel | (noun) a violent hot sand-laden wind on the deserts of Arabia and North Africa | Synonyms: simoom, simoon |
|---|
| sandal | (noun) a shoe consisting of a sole fastened by straps to the foot | - |
|---|
| sapropel | (noun) sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans | - |
|---|