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.
Other Word Forms of Ectomorph
Origin of Ectomorph
Derived from ectoderm + -morph from William Herbert Sheldon.
From American Heritage Dictionary of the English Language, 5th Edition
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Words Starting With E and Ending With H