ectomorph

ec to morph |ˈektəˌmôrf ˈektoʊmɔːrf | ▶noun Physiology a person with a lean and delicate body build. Compare with endomorph and mesomorph. DERIVATIVES ec to mor phic |ˌektəˈmôrfik |adjective, ec to morph y noun ORIGIN 1940s: ecto- from ectodermal (being the layer of the embryo giving rise to physical characteristics that predominate ) + -morph .

ectomorph

ectomorph |ˈɛktə (ʊ )mɔːf | ▶noun Physiology a person with a lean and delicate build of body. Compare with endomorph and mesomorph. DERIVATIVES ectomorphic |-ˈmɔːfɪk |adjective, ectomorphy noun ORIGIN 1940s: ecto- from ectodermal (being the layer of the embryo giving rise to physical characteristics which predominate ) + -morph .