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ectomorph (n.)

"person with a slim physique and an introverted, thoughtful personality," 1940, coined by American psychologist William H. Sheldon from ectoderm + -morph, from Greek morphē "form, shape; beauty, outward appearance," a word of uncertain etymology. So called for the embryonic ectoderm, which develops the nervous system. Related: Ectomorphic.

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Definitions of ectomorph from WordNet

ectomorph (n.)
a person with a thin body;
From wordnet.princeton.edu