| COSTALLY | • costally adv. In terms of the ribs or costae. • COSTALLY adv. relating to the ribs. |
| COSTARDS | • costards n. Plural of costard. • COSTARD n. an apple, large and round like the head. |
| COSTATED | • costated v. Simple past tense and past participle of costate. • costated adj. Costate. • COSTATED adj. having ribs, also COSTATE. |
| COSTEANS | • costeans v. Third-person singular simple present indicative form of costean. • COSTEAN v. in mining, to sink pits through the surface soil to the underlying rock in order to establish the direction of a lode. |
| COSTINGS | • costings n. Plural of costing. • COSTING n. an estimation of the cost of something. |
| COSTLESS | • costless adj. Having no cost. • COSTLESS adj. free of charge. |
| COSTLIER | • costlier adj. Comparative form of costly: more costly. • COSTLY adj. expensive. |
| COSTMARY | • costmary n. An aromatic plant (Tanacetum balsamita), once used to flavour ale (prior to the use of hops). • COSTMARY n. a garden plant having a strong balsamic smell, aka alecost, used as a pot herb and salad plant and in flavoring ale and beer. |
| COSTRELS | • costrels n. Plural of costrel. • COSTREL n. an eared bottle or small flask, to be hung at the waist. |
| COSTUMED | • costumed v. Simple past tense and past participle of costume. • costumed adj. Wearing a costume; disguised. • COSTUME v. to dress. |
| COSTUMER | • costumer n. A person who designs, makes or supplies theatrical costumes; a costumier. • costumer n. A person who wears a costume or takes part in cosplay. • costumer n. (Informal) A costume drama. |
| COSTUMES | • costumes n. Plural of costume. • costumes v. Third-person singular simple present indicative form of costume. • COSTUME v. to dress. |
| COSTUMEY | • costumey adj. (Informal, of clothing) Overly elaborate, like a costume. • COSTUMEY adj. pertaining to a costume. |
| COSTUSES | • costuses n. Plural of costus. • COSTUS n. an aromatic root of the ginger family. |