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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Keratosa  \Ker`a*to"sa\,  n.  pl  [NL.,  fr  Gr  ke`ras,  -atos,  a 
  horn.]  (Zo["o]l.) 
  An  order  of  sponges  having  a  skeleton  composed  of  hornlike 
  fibers.  It  includes  the  commercial  sponges.