pla·no-con·cave /ˌpleno(ˌ)kɑnˈkev, ˈkɑnˌ/
(a.)平凹的
pla·no-con·cave /ˌpleno(ˌ)kɑnˈkev, ˈkɑnˌ/ 形容詞
Pla·no-con·cave a. Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens.
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planoconcave
adj : flat on one side and concave on the other