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ectomorphic

[ek-tuh-mawr-fik]
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adjective
  1. having a thin body build, roughly characterized by the relative prominence of structures developed from the embryonic ectoderm (contrasted with endomorphic, mesomorphic).

Origin of ectomorphic

First recorded in 1935–40; ecto- + -morphic
Related formsec·to·morph·y, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018