| coiled | (adjective) curled or wound (especially in concentric rings or spirals) | - |
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| coiling | (adjective) in the shape of a coil | Synonyms: helical, spiral, spiraling, spiralling, turbinate, volute, voluted, whorled |
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| coincident | (adjective) matching point for point | - |
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| (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincidental, coinciding, concurrent, cooccurring, simultaneous |
| coincidental | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coinciding, concurrent, cooccurring, simultaneous |
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| coinciding | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coincidental, concurrent, cooccurring, simultaneous |
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| coital | (adjective) of or relating to coitus or copulation | Synonyms: copulatory |
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