Main Entry: bi·con·cave

Pronunciation: \ˌbī-(ˌ)kän-ˈkāv, (ˈ)bī-ˈkän-ˌ\

Function: adjective

: concave on both sides <biconcave vertebrae> <a biconcave lens>

—bi·con·cav·i·ty \ˌbī-(ˌ)kän-ˈkav-ət-ē\ noun, plural bi·con·cav·i·ties