Definition of "ectomorph" [ectomorph]

• An individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "To fit a size 6 pair of jeans, you need narrower than average hips - an 'ectomorph' build."
• "John Kruk, the ESPN analyst who was anything but an ectomorph during his playing days, said the signings show that baseball has returned to an understanding that physical appearance doesn't matter as much as quick wrists and live arms."
• "I am a rather pale scrawny blue-eyed ectomorph of nearly pure Northern European ancestry, as far as I can tell."