1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Regularia  \Reg`u*la"ri*a\  (r[e^]g`[-u]*l[=a]"r[i^]*[.a]),  n.pl. 
  [NL.]  (Zo["o]l.) 
  A  division  of  Echini  which  includes  the  circular,  or  regular, 
  sea  urchins. 

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