Definition of ectomorph noun from the Oxford Advanced Learner's Dictionary

 

ectomorph

 noun
noun
BrE BrE//ˈektəʊmɔːf//
 
; NAmE NAmE//ˈektoʊmɔːrf//
 
(biology) Body shape
 
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a person whose natural body shape is thin compare endomorph, mesomorph See related entries: Body shape Word Origin 1940s: ecto- from ectodermal (being the layer of the embryo giving rise to physical characteristics which predominate) + -morph.
See the Oxford Advanced American Dictionary entry: ectomorph