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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Holothurioidea  \Hol`o*thu`ri*oi"de*a\,  n.  pl  [NL.  See 
  {Holothure},  and  {-oid}.]  (Zo["o]l.) 
  One  of  the  classes  of  echinoderms. 
  Note:  They  have  a  more  or  less  elongated  body,  often 
  flattened  beneath,  and  a  circle  of  tentacles,  which  are 
  usually  much  branched,  surrounding  the  mouth;  the  skin 
  is  more  or  less  flexible,  and  usually  contains 
  calcareous  plates  of  various  characteristic  forms, 
  sometimes  becoming  large  and  scalelike.  Most  of  the 
  species  have  five  bands  (ambulacra)  of  sucker-bearing 
  feet  along  the  sides;  in  others  these  are  lacking.  In 
  one  group  (Pneumonophora)  two  branching  internal  gills 
  are  developed;  in  another  (Apneumona)  these  are 
  wanting.  Called  also  {Holothurida},  {Holothuridea},  and