\Cal"i*cle\, n. [L. caliculus a small cup, dim. of
calicis, a cup. Cf {Calycle}.] (Zo["o]l.)
(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}.]