An alternative or archaic plural form of calyculus, referring to multiple small cup-shaped botanical structures.
This is a Latin plural form derived from calyculus (diminutive of calyx). The -li ending is characteristic of Latin second declension neuter or masculine nouns in their plural accusative or nominative forms.
Language lovers will notice this is a 'competing plural'—calyculi and calycli both exist, showing how scientific terminology sometimes inherited multiple Latin forms rather than settling on just one!
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