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Ectomorph

//ˈɛktəʊmɔːf// noun

Noun

1
Someone with a lean, only slightly muscular body
"Also there was a woman I hadn't met, a chain-smoking French ectomorph whose job it was to make sense of records of public spending in the Ministry of Finance."
2
a person with a thin body wordnet
3
Theoretical body type in which a person has a high metabolism. Such a person can easily maintain a low fat physique, but does not add muscle or body weight easily.
"The ectomorph body type is characterized by narrow shoulders and hips and a lean build. Its naturally fast metabolism makes it easy for ectomorphs to lose or maintain body fat levels but more difficult to build muscle."

Derived from ectoderm + -morph from William Herbert Sheldon. Equivalent to ecto- + -morph.

Unscramble this word: ectomorph