planoconcave

from WordNet (r) 3.0 (2006)

planoconcave
    adj 1: flat on one side and concave on the other

from The Collaborative International Dictionary of English v.0.48

Plano-concave \Pla"no-con"cave\, a. [Plano- + concave.]
   Plane or flat on one side, and concave on the other; as, a
   plano-concave lens. See {Lens}.
   [1913 Webster]