Ectomorph Definition
 ĕktə-môrf 
    noun
  
 An ectomorphic individual.
 Webster's New World 
An individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate.
 American Heritage Medicine 
(bodybuilding): Theoretical body type in which a person has a high metabolism. Such a person can easily maintain a low fat physique, but does not add muscle or body weight easily.
 Wiktionary 
Other Word Forms of Ectomorph
Noun
Singular:
 ectomorphPlural:
 ectomorphsOrigin of Ectomorph
-  
Derived from ectoderm + -morph from William Herbert Sheldon.
From Wiktionary
 ecto(derm) –morph
From American Heritage Dictionary of the English Language, 5th Edition
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