1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Labellum  \La*bel"lum\,  n.;  pl  L.  {Labella},  E.  {Labellums}. 
  [L.,  dim.  of  labrum  lip.] 
  1.  (Bot.)  The  lower  or  apparently  anterior  petal  of  an 
  orchidaceous  flower,  often  of  a  very  curious  shape. 
 
  2.  (Zo["o]l.)  A  small  appendage  beneath  the  upper  lip  or 
  labrum  of  certain  insects. 

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