| Word | Definitions | Synonyms |
|---|---|---|
| cotyledon | (noun) embryonic leaf in seed-bearing plants | Synonyms: seed leaf |
| cotyloid | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: acetabular, cotyloidal |
| cotyloidal | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: acetabular, cotyloid |