A light and delicate physique or body build, believed by the US psychologist William H. Sheldon (1899–1977) and followers of his constitutional psychology to be associated with such personality characteristics as alertness, intellectualism, and inhibition. Compare endomorph, mesomorph. ectomorphic adj. ectomorphy n. The state or condition of being an ectomorph. [From Greek ektos outside + morphe a form or shape]
Subjects: Psychology — Medicine and Health.