The Collaborative International Dictionary
convexo-concave
bulging \bulging\ adj.
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curving or bulging outward. Opposite of concave. [Narrower terms: biconvex, convexo-convex, lenticular, lentiform; broken-backed, hogged; convexo-concave; gibbous, gibbose; planoconvex] Also See: protrusive.
Syn: convex.
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curving outward.
Syn: bellied, bellying, bulbous, bulgy, protuberant.
WordNet
convexo-concave
adj. convex on one side and concave on the other with the convexity being greater than the concavity
Usage examples of "convexo-concave".
If it passes through a convexo-concave lens, it can even be narrowed!