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1. Convex on one side and concave on the other.
2. Having greater curvature on the convex side than on the concave side. Used of a lens.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. having one side convex and the other side concave
2. (General Physics) (of a lens) having a convex face with greater curvature than the concave face. Compare concavo-convex2
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
con•vex•o-con•cave(kənˈvɛk soʊ kɒnˈkeɪv)
2. of or designating a lens in which the convex face has a greater degree of curvature than the concave face.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.