DEFINITIONS

ecto-

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

Content related to ecto-

English Affixes From A To Z: A One-Stop List Of Suffixes, Prefixes, and Combining FormsIn English, we love to make new words by adding all sorts of bits to the front and back of existing terms. These are called affixes, and they are added to the base or stem of a word. When attached to the end of word, the affix is called a suffix. And to the beginning? A prefix.
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Words nearby ecto-

ectatic, ectental, ectethmoid, ecthlipsis, ecthyma, ecto-, ectoantigen, ectoblast, ectocardia, ectocervix, ectocommensal
Also especially before a vowel, ect-.

Origin of ecto-

combining form of Greek ektós outside
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for ecto-

ecto-

combining form

indicating outer, outside, externalectoplasm

Word Origin for ecto-

from Greek ektos outside, from ek, ex out
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

Medicine definitions for ecto-

ecto-

pref.

Outer; external:ectoparasite.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.