The Collaborative International Dictionary of English v.0.48:

Calicle \Cal"i*cle\, n. [L. caliculus a small cup, dim. of
   calicis, a cup. Cf Calycle.] (Zool.)
   (a) One of the small cuplike cavities, often with elevated
       borders, covering the surface of most corals. Each is
       formed by a polyp.
   (b) One of the cuplike structures inclosing the zooids of
       certain hydroids. See Campanularian. [Written also
       calycle. See Calycle.]
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Calycle \Cal"y*cle\, n. [L.calyculus small flower bud, calyx,
   dim. of calyx. See Calyx, and cf. Calicle.] (Bot.)
   A row of small bracts, at the base of the calyx, on the
   outside.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calycle
    n 1: a group of bracts simulating a calyx as in a carnation or
         hibiscus [syn: epicalyx, false calyx, calycle,
         calyculus]
    2: a small cup-shaped structure (as a taste bud or optic cup or
       cavity of a coral containing a polyp) [syn: calyculus,
       caliculus, calycle]