| Word | Definitions | Synonyms |
|---|---|---|
| biconcave | (adjective) concave on both sides | Synonyms: concavo-concave |
| cavernous | (adjective) filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood | Synonyms: erectile |
| (adjective) being or suggesting a cavern | - | |
| concave | (adjective) curving inward | - |
| planoconcave | (adjective) flat on one side and concave on the other | - |