| 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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| rosaceous | (adjective) of or pertaining to or characteristic of plants of the family Rosaceae | - |
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| (adjective) of something having a dusty purplish pink color | Synonyms: rose, roseate |
| rosary | (noun) a string of beads used in counting prayers (especially by Catholics) | Synonyms: prayer beads |
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| rose | (adjective) of something having a dusty purplish pink color | Synonyms: rosaceous, roseate |
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| (noun) a dusty pink color | Synonyms: rosiness |
| (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 |
| roseate | (adjective) of something having a dusty purplish pink color | Synonyms: rosaceous, rose |
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| 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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| (verb) rub rosin onto | - |
| 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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| rostrate | (adjective) having a beak or beaklike snout or proboscis | - |
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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 |
| rosy | (adjective) presaging good fortune | Synonyms: fortunate |
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| (adjective) of blush color | Synonyms: blushful |
| (adjective) having the pinkish flush of health | Synonyms: flushed, rose-cheeked, rosy-cheeked |
| (adjective) reflecting optimism | Synonyms: rose-colored |