Source : Webster's Revised Unabridged Dictionary (1913)

Silicoidea \Sil`i*coi"de*a\, n. pl. [NL. See {Silex}, and
   {-oid}.] (Zo["o]l.)
   An extensive order of Porifera, which includes those that
   have the skeleton composed mainly of siliceous fibers or
   spicules.