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convexo-concave lens in Medicine

convexo-concave lens

n.
  1. A lens having one surface convex and the opposite surface concave, with the concave surface having the greater curvature.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.