ectomorph
Word family nounectoblastectocrineectodermectoenzymeectogenesisectogenyectomorphectomorphyectoparasiteectophyteectoplasmectosarcectothermectothermyectozoanectozoonadjectiveectoblasticectodermalectogeneticectogenicectogenousectomorphicectoparasiticectophyticectoplasmicectoplasticectothermicectotrophicectozoic
ec·to·morph /ˈektəʊˌmɔːf $ ˈektoʊˌmɔːrf/ noun [countableC] technical someone with a naturally thin body 瘦型体质者