noun
a person with a lean and delicate body build
adjective
describing a lean and delicate body build
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An ectomorph is a body type characterized by a lean and slender build with little body fat.
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My friend is such an ectomorph, he can eat anything and never gain weight.
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Ectomorphs are often called 'skinny minnies' by some people.
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In the world of bodybuilding, ectomorphs are like marathon runners compared to the bulky sprinters.