| colubrid | (noun) mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes | Synonyms: colubrid snake |
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| colugo | (noun) arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps | Synonyms: flying cat, flying lemur |
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| columbarium | (noun) a sepulchral vault or other structure having recesses in the walls to receive cinerary urns | - |
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| (noun) a niche for a funeral urn containing the ashes of the cremated dead | Synonyms: cinerarium |
| (noun) a birdhouse for pigeons | Synonyms: columbary, dovecote |
| columbary | (noun) a birdhouse for pigeons | Synonyms: columbarium, dovecote |
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| columbine | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, aquilegia |
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| columbite | (noun) a black mineral that is an ore of niobium and tantalum | Synonyms: niobite |
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| columbium | (noun) a former name for niobium | - |
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| columbo | (noun) any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington | Synonyms: American columbo, American gentian, deer's-ear, deer's-ears, pyramid plant |
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| columella | (noun) a small column (or structure resembling a column) that is a part of a plant or animal | - |
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| column | (noun) (architecture) a tall vertical cylindrical structure standing upright and used to support a structure | Synonyms: pillar |
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| (noun) a vertical cylindrical structure standing alone and not supporting anything (such as a monument) | Synonyms: pillar |
| (noun) a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands | Synonyms: chromatography column |
| (noun) any tubular or pillar-like supporting structure in the body | - |
| (noun) an article giving opinions or perspectives | Synonyms: editorial, newspaper column |
| (noun) a page or text that is vertically divided | - |
| (noun) a line of units following one after another | - |
| (noun) a vertical array of numbers or other information | - |
| (noun) anything that approximates the shape of a column or tower | Synonyms: pillar, tower |
| columnar | (adjective) characterized by columns | - |
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| (adjective) having the form of a column | Synonyms: columniform, columnlike |
| columnea | (noun) tropical plant having thick hairy somewhat toothed leaves and solitary or clustered yellow to scarlet flowers; many cultivated for their flowers and ornamental foliage | - |
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| columned | (adjective) having or resembling columns; having columns of a specified kind (often used as a combining form) | - |
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| columniation | (noun) (architecture) the arrangement of columns (especially freestanding columns) in a structure | - |
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| columniform | (adjective) having the form of a column | Synonyms: columnar, columnlike |
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| columnist | (noun) a journalist who writes editorials | Synonyms: editorialist |
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| columnlike | (adjective) having the form of a column | Synonyms: columnar, columniform |
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