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An individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate.
ec•to•mor•phic(ˌɛk təˈmɔr fɪk)
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|Adj.||1.||ectomorphic - having a build with little fat or muscle but with long limbs|
lean, thin - lacking excess flesh; "you can't be too rich or too thin"; "Yon Cassius has a lean and hungry look"-Shakespeare