biconvexity
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biconvexity — noun see biconvex … New Collegiate Dictionary
biconvexity — n. state of being concave on two sides … English contemporary dictionary
biconvex — biconvexity, n. /buy kon veks, buy kon veks /, adj. convex on both sides, as a lens. See diag. under lens. [1840 50; BI 1 + CONVEX] * * * … Universalium
biconvex — adjective Etymology: International Scientific Vocabulary Date: circa 1852 convex on both sides • biconvexity noun … New Collegiate Dictionary