| costal | (adjective) of or relating to or near a rib | - |
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| costate | (adjective) having ribs | - |
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| (adjective) (of the surface) having a rough, riblike texture | Synonyms: ribbed |
| costive | (adjective) retarding evacuation of feces; binding; constipating | - |
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| costless | (adjective) costing nothing | Synonyms: complimentary, free, gratis, gratuitous |
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| costly | (adjective) having a high price | Synonyms: dear, high-priced, pricey, pricy |
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| (adjective) entailing great loss or sacrifice | Synonyms: dearly-won |
| costumed | (adjective) dressed in clothing characteristic of a period, country, or class | - |
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