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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. An individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate.

Wiktionary

  1. n. Someone with a lean, only slightly muscular body
  2. n. : 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.

WordNet 3.0

  1. n. a person with a thin body

Etymologies

  1. ecto(derm) + -morph.

Examples

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Lists

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‘ectomorph’ has been looked up 1528 times, loved by 4 people, added to 14 lists, commented on 1 time, and has a Scrabble score of 18.