Definition of plano-concave in English:

plano-concave

adjective

  • (of a lens) with one surface plane and the opposite one concave.

    • ‘This tutorial explores lens action in plano-concave lenses when the object faces the flat side of the lens.’
    • ‘Plano-concave axicons are made of a plano surface in combination with a concave conical surface.’

Pronunciation:

plano-concave

/ˌplānōˌkänˈkāv//-ˈkänˌkāv/