ecto-

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

QUIZZES

TAKE ROUND 2 OF OUR PSAT VOCABULARY QUIZ!

Here is our second set of teacher-selected PSAT vocabulary words. Do you know the meanings of these terms?
Question 1 of 10
advocate
to give up possession or occupancy of.
to speak or write in favor of; support or urge by argument; recommend publicly.
to pronounce or decree by judicial sentence.
TAKE THE QUIZ TO FIND OUT
Also especially before a vowel, ect-.

Origin of ecto-

combining form of Greek ektós outside

Words nearby ecto-

ectatic, ectental, ectethmoid, ecthlipsis, ecthyma, ecto-, ectoantigen, ectoblast, ectocardia, ectocervix, ectocommensal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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

Medical 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.