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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Cribellum  \Cri*bel"lum\  (kr?b?l"l?m),  n.  [L.,  a  small  sieve, 
  dim.  of  cribrum  sieve.]  (Zo["o]l.) 
  A  peculiar  perforated  organ  of  certain  spiders 
  ({Ciniflonid[ae]}),  used  for  spinning  a  special  kind  of  silk.