Having the shape or form of a cup; cup-shaped or resembling a small cup.
From Latin 'cupula' (small cup, diminutive of 'cupa') plus '-ar' (adjective suffix). The term is used in botany and zoology to describe structures that have a cup-like form.
In botany, cupular describes the special cup-shaped structures that hold acorns and beechnuts—that little cap is called a cupule, and it's actually a modified branch that helps protect the developing seed.
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