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Wiktionary
calyculus

alt. 1 (context zoology English) any cup-shaped structure. 2 (context botany English) (context British English) A group of bracts resembling an outer calyx. n. 1 (context zoology English) any cup-shaped structure. 2 (context botany English) (context British English) A group of bracts resembling an outer calyx.

WordNet
calyculus
  1. n. a group of bracts simulating a calyx as in a carnation or hibiscus [syn: epicalyx, false calyx, calycle]

  2. a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) [syn: caliculus, calycle]