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[mez-uh-mawrf, mes-, mee-zuh-, -suh-] /ˈmɛz əˌmɔrf, ˈmɛs-, ˈmi zə-, -sə-/
a person of the mesomorphic type.
1935-40; meso- + -morph Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for mesomorph


a person with a muscular body build: said to be correlated with somatotonia Compare ectomorph, endomorph (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for mesomorph

1940, from meso- + Greek morphe "form" (see Morpheus). Coined by W.H. Shelton; the reference is to the mesodermal layer of the embryo. Related: Mesomorphic (attested from 1923 in chemistry).

Online Etymology Dictionary, © 2010 Douglas Harper
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mesomorph in Medicine

mesomorph mes·o·morph (měz'ə-môrf', měs'-)
An individual characterized by a robust muscular body build in which tissues derived from the embryonic mesodermal layer predominate.

mes'o·mor'phic adj.
mes'o·mor'phism or mes'o·mor'phy n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for mesomorph

a human physical type (soma- totype) that is marked by greater than average muscular development, as determined by the physique classification system developed by American psychologist W.H. Sheldon. Although the Sheldon system of classification does not make absolute distinctions between types, a person is classed as a mesomorph if mesomorphy predominates over endomorphy and ectomorphy in his body build. The extreme mesomorph has a square, massive head; broad, muscular chest and shoulders; a large heart; heavily muscled arms and legs; and minimal body fat. He tends to develop muscle easily. His muscular development can usually be distinguished from that of one who has developed his muscles through body-building exercises. Compare ectomorph; endomorph.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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