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a combining form with the meanings “height,” “tip end,” “extremities of the body,” used in the formation of compound words:
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 Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for acro-


combining form
denoting something at a height, summit, top, tip, beginning, or end: acropolis, acrogen
denoting an extremity of the human body: acromegaly
Word Origin
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
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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
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acro- in Medicine

acro- or acr-

  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.
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