concavo-concave

con·ca·vo-con·cave

C0542500 (kŏn-kā′vō-kŏn-kāv′)adj. Concave on both surfaces; biconcave. Used of a lens.

concavo-concave

(kɒnˌkeɪvəʊkɒnˈkeɪv) adj (General Physics) (esp of a lens) having both sides concave; biconcave

con•ca•vo-con•cave

(kɒnˈkeɪ voʊ kɒnˈkeɪv)

adj. concave on both sides. [1725–35]

Thesaurus

Adj.	1.concavo-concave - concave on both sides biconcaveconcave - curving inward