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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hypoptilum  \Hy*pop"ti*lum\,  n.;  pl  L.  {Hypoptila},  E. 
  {Hypoptilums}.  [NL.,  fr  Gr  "ypo`  beneath  +  ?  down.] 
  An  accessory  plume  arising  from  the  posterior  side  of  the 
  stem  of  the  contour  feathers  of  many  birds;  --  called  also 
  {aftershaft}.  See  Illust.  of  {Feather}.