Cupule | Word Cupule at Open Dictionary of English by LearnThat Foundation

6D: Nut with a cupule (ACORN) - remembered this feature from some earlier discussion we had about the word "cupule"
A common form of prehistoric rock-art here in California is the cupule.
Cohesion of the bracts by their edges, so as to form a tubular involucre, or by their surfaces, so as to form a cupule, is not of uncommon occurrence, under natural...
PS (2008) Molecular phylogenetics and cupule evolution in Fagaceae as inferred from nuclear CRABS CLAW sequences.

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A "cupola" is a domed structure or roof, a "cupula" is a part shaped like a cup, while a "cupule" is a concave bodily structure, usually in trees.

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