ectomorph, endomorph, and mesomorph

Cultural

A person whose body structure is dominated by the outer skin and the nervous system. Ectomorphs are thin and have a large skin surface relative to their weight. Endomorphs are heavy and flabby, and mesomorphs are sturdy and strong, with highly developed bones and muscles.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023