What does endomorphy mean?
Endomorphy is a technical term from constitutional psychology and physical anthropology denoting a body build dominated by roundness, softness, and a tendency to accumulate fat. The term was introduced by American psychologist William H. Sheldon in the 1940s as part of his somatotype system, which classified physiques along three components: endomorphy, mesomorphy, and ectomorphy. The name derives from Greek roots meaning 'inner form,' echoing the embryological term endoderm, the germ layer that develops into the digestive organs. In practice, endomorphy is measured as a rating on a standardized scale, so a person may show high, moderate, or low degrees of it rather than belonging to a fixed category. Although Sheldon's claim that body shape predicts personality has been largely discredited, the term survives in kinanthropometry and sports science, where describing an athlete's endomorphy remains a neutral way of characterizing physique without pejorative overtones.
nounThe physical condition or constitutional type of having a soft, rounded body build characterized by a predominance of endodermal-derived tissue; in somatotype theory, the degree to which a person exhibits the endomorphic component.
- A predominance of the endomorphic component in one's bodily constitution, marked by roundness, softness, and relative fatness (chiefly in somatotype theory).
"According to Sheldon's classification, pronounced endomorphy tends to accompany a relaxed, sociable temperament."
"Sheldon rated each subject for endomorphy, mesomorphy, and ectomorphy on a seven-point scale."
"His natural endomorphy made weight gain easy and weight loss a lifelong struggle."
Rarely pluralized; the uncountable singular is standard even when comparing individuals or populations.
"The study compared average endomorphies across the two athletic cohorts."
Coined by psychologist William Sheldon in the 1940s, 'endomorphy' literally means 'inner form'—a name borrowed from embryology, where the endoderm becomes your gut and internal organs.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of endomorphy
Endomorphy was coined by American psychologist William H. Sheldon in the 1940s for his system of somatotypes. It combines the Greek prefix endo- ('within') with morphē ('form'), by analogy with endoderm, the innermost embryonic germ layer—a nod to Sheldon's theory that body build reflected the relative dominance of embryonic layers. Its siblings are mesomorphy and ectomorphy, sharing the same root morphē with words such as morphology and amorphous.
Related word forms
How endomorphy is actually used
Formal and technical, used mainly in constitutional psychology, physical anthropology, and sports science. Because Sheldon's linking of body types to personality is now considered scientifically discredited, the word often carries a historical or critical tone when discussing his work, though it remains neutral descriptive vocabulary in kinanthropometry.
Easily confused with endomorphy
An endomorph is the person who has an endomorphic build, while endomorphy is the quality or condition of that build itself.