| circle | (noun) movement once around a course | Synonyms: circuit, lap |
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| (noun) any circular or rotating mechanism | Synonyms: round |
| (noun) a road junction at which traffic streams circularly around a central island | Synonyms: rotary, roundabout, traffic circle |
| (noun) a curved section or tier of seats in a hall or theater or opera house; usually the first tier above the orchestra | Synonyms: dress circle |
| (noun) street names for flunitrazepam | Synonyms: forget me drug, Mexican valium, R-2, roach, roofy, rope, rophy |
| (noun) an unofficial association of people or groups | Synonyms: band, lot, set |
| (noun) ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point | - |
| (noun) something approximating the shape of a circle | - |
| semicircle | (noun) a plane figure with the shape of half a circle | Synonyms: hemicycle |
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| tubercle | (noun) a protuberance on a bone especially for attachment of a muscle or ligament | Synonyms: eminence, tuberosity |
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| (noun) small rounded wartlike protuberance on a plant | Synonyms: nodule |
| (noun) a swelling that is the characteristic lesion of tuberculosis | - |