ectomorph

 
Pronunciation: /ˈɛktə(ʊ)mɔːf/

noun

Physiology

Derivatives

ectomorphic

Pronunciation: /-ˈmɔːfɪk/
adjective

ectomorphy

noun

Origin:

1940s: ecto- from ectodermal (being the layer of the embryo giving rise to physical characteristics which predominate) + -morph