ec·to·morph
noun/ˈektəʊmɔːf/
/ˈektəʊmɔːrf/
(biology)- a person whose natural body shape is thin
瘦型体质者；外胚层体型者 Word Origin1940s: ecto- from ectodermal (being the layer of the embryo giving rise to physical characteristics which predominate) + -morph.