Plano-concave
Pronunciation : Pla"no-con"cave
Part of Speech : a.
Etymology : [Plano- + concave.]
Definition : Defn: Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder