Apterium Definition
 aptirēəm 
  apteria
  
    noun
  
 A bare area of skin between feather tracts on the body of a bird.
 Webster's New World 
(ornithology) An area of bare (featherless) skin on a bird.
Wiktionary 
Other Word Forms of Apterium
Noun
Singular:
 apteriumPlural:
 apteriaOrigin of Apterium
See aptera.
From Wiktionary
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