| 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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