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Webster's 1828 Dictionary

PLANO-CONVEX

a.[plain and convex. ] Plain or flat on one side and convex on the other; as a plano-convex lens.

 

Webster's 1913 Dictionary

PLANO-CONVEX

Pla "no-con "vex, a. Etym: [Plano- + convex. ]

 

Defn: Plane or flat on one side, and convex on the other; as, a plano-convex lens. See Convex, and Lens.

 

New American Oxford Dictionary

plano-convex

pla no-con vex |ˌplānōˌkänˈveks, -ˈkänˌveks ˌpleɪnoʊˌkɑnˈvɛks | ▶adjective (of a lens ) with one surface plane and the opposite one convex.