A small cup-shaped structure, especially in anatomy or botany, such as a cup at the base of a flower or a small anatomical depression.
From Latin caliculus, a diminutive form of calix meaning 'cup.' The term has been used since medieval Latin in medical and botanical texts to describe small cup-like formations in living organisms.
The Romans were obsessed with size gradations in language—they had words for cup, small cup, and even smaller cup, which is why we can describe intricate natural structures with a single precise term that English would need a whole phrase for.
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