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