One of the mysteries of the English language finally explained.
(of a lens) convex on one side and concave on the other and thickest in the centre.
- ‘A pad member 15 is securely attached to a concave side 13 of the convexo-concave member 11 and is made of absorbent cotton material.’
- ‘The steady-state profile is convexo-concave, and the convexity has a width corresponding exactly to the area where the first term is dominant.’
- ‘The Björk-Shiley convexo-concave prosthetic valve was introduced in 1979.’
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