| circadian | (adjective) of or relating to biological processes occurring at 24-hour intervals | - |
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| circinate | (adjective) shaped like a ring | Synonyms: annular, annulate, annulated, doughnut-shaped, ring-shaped, ringed |
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| circuitous | (adjective) deviating from a straight course | Synonyms: devious, roundabout |
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| (adjective) marked by obliqueness or indirection in speech or conduct | Synonyms: roundabout |
| circular | (adjective) having the shape or form of a circle | Synonyms: round |
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| (adjective) describing a circle; moving in a circle | Synonyms: orbitual, rotary |
| circulating | (adjective) passing from one to another | - |
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| circulative | (adjective) of or relating to circulation | Synonyms: circulatory |
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| circulatory | (adjective) relating to circulatory system or to circulation of the blood | - |
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| (adjective) of or relating to circulation | Synonyms: circulative |
| circumboreal | (adjective) comprising or throughout far northern regions | Synonyms: boreal |
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| circumferent | (adjective) closely encircling | Synonyms: encompassing, surrounding |
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| circumferential | (adjective) lying around or just outside the edges or outskirts | - |
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| circumlocutious | (adjective) roundabout and unnecessarily wordy | Synonyms: ambagious, circumlocutory, periphrastic |
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| circumlocutory | (adjective) roundabout and unnecessarily wordy | Synonyms: ambagious, circumlocutious, periphrastic |
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| circumpolar | (adjective) located or found throughout a polar region | - |
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| (adjective) (of a celestial body) continually visible above the horizon during the entire 360 degrees of daily travel | - |
| circumscribed | (adjective) subject to limits or subjected to limits | Synonyms: limited |
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| circumspect | (adjective) heedful of potential consequences | Synonyms: discreet |
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| circumstantial | (adjective) fully detailed and specific about particulars | - |
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