"Convexo-Concave" is a word in ENGLISH
convexo-concave
ENGLISH
Definition:
Convex on one side, and concave on the other. The
curves of the convex and concave sides may be alike or may be
different. See Meniscus.
Few words of positivity
Put your ear down close to your soul and listen hard.
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camera obscura
ENGLISH
An apparatus in which the images of external objects, formed by a convex lens or a concave mirror, are thrown …
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