The word for today is…
lenticular (adj) – 1. Shaped like a biconvex lens.
2. Of or relating to a lens.
Source : The Free Dictionary
Etymology : “Lentil-shaped”—that’s the meaning of Latin lenticularis, the parent of English’s lenticular. It’s an appropriate predecessor because a double-convex lens is one that is curved on both sides, giving it a shape similar to that of a lentil. English speakers borrowed the Latin term in the 15th century. Lenticularis, in turn, derives from lenticula, which is the source of the English word lentil and a diminutive of the Latin form lent-, lens, meaning “lentil.” You probably won’t be too surprised to learn that lent-, lens also gave English the word lens.
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