Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Someone with a lean, only slightly muscular body
  • n. : 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a person with a thin body

Etymologies

ecto(derm) + -morph.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Derived from ectoderm +‎ -morph from William Herbert Sheldon. (Wiktionary)

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