| corydalis | (noun) a plant of the genus Corydalis with beautiful compound foliage and spurred tubular flowers | - |
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| corymb | (noun) flat-topped or convex inflorescence in which the individual flower stalks grow upward from various points on the main stem to approximately the same height; outer flowers open first | - |
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| corynebacterium | (noun) any species of the genus Corynebacterium | - |
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| coryphantha | (noun) a cactus of the genus Coryphantha | - |
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| corythosaur | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaurus |
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| corythosaurus | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaur |
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| coryza | (noun) an inflammation of the mucous membrane lining the nose (usually associated with nasal discharge) | Synonyms: rhinitis |
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