plano-concave Syllabification: (pla·no-con·cave)Pronunciation: /ˌplānōˌkänˈkāv, -ˈkänˌkāv/Definition of plano-concave adjective (of a lens) with one surface plane and the opposite one concave. plano-concave in other Oxford dictionaries Definition of plano-concave in the British & World English dictionary
