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Adjective: biconvex  ,bI,kón'veks or bI'kón,veks
  1. Convex on both sides; shaped like a lentil
    "The image of a point at infinite distance from the biconvex lens is on the opposite side of the lens";
    - convexo-convex, lenticular, lentiform

See also: bulging, convex

Encyclopedia: Biconvex