ectomorph
noun/ˈektəʊmɔːf/
/ˈektəʊmɔːrf/
(biology)- a person whose natural body shape is thin compare endomorph, mesomorphTopics Appearancec2Word Origin1940s: ecto- from ectodermal (being the layer of the embryo giving rise to physical characteristics which predominate) + -morph.
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ectomorph