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ecto-

  1. a combining form meaning “outer,” “outside,” “external,” used in the formation of compound words:

    ectoderm.

ecto-

combining_form

  1. indicating outer, outside, external

    ectoplasm

“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 History and Origins

Origin of ecto-1

Combining form of Greek ó outside
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Word History and Origins

Origin of ecto-1

from Greek ektos outside, from ek, ex out

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