1. a combining form with the meanings “height,” “tip end,” “extremities of the body,” used in the formation of compound words: acrophobia.
Also especially before a vowel, acr-.

Origin of acro-

< Greek, combining form of ákros topmost, highest; akin to Latin ācer sharp. Cf. acme, ear2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for acro-


combining form
  1. denoting something at a height, summit, top, tip, beginning, or endacropolis; acrogen
  2. denoting an extremity of the human bodyacromegaly

Word Origin for acro-

from Greek akros extreme, topmost
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

Word Origin and History for acro-

word-forming element meaning "highest, topmost, at the extremities," before vowels, acr-, from Greek akro- "pertaining to an end, extreme," comb. form of akros "at the end, at the top" (see acrid).

Online Etymology Dictionary, © 2010 Douglas Harper

acro- in Medicine


  1. Top; summit; height:acrophobia.
  2. Tip; beginning:acrosome.
  3. Extremity of the body:acroparalysis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.