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[as-il, -eel] /ˈæs ɪl, -il/
adjective, Chemistry
containing the acyl group.
Origin of acyl
1895-1900; < German: an organic radical derived from an acid; see acid, -yl Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for acyl


(modifier) of, denoting, or containing the monovalent group of atoms RCO-, where R is an organic group: acyl group or radical, acyl substitution
an organometallic compound in which a metal atom is directly bound to an acyl group
Word Origin
C20: from acid + -yl
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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acyl in Medicine

acyl ac·yl (ās'əl)
A organic radical having the general formula RCO, derived from the removal of a hydroxyl group from an organic acid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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acyl in Science
An organic compound containing the group RCO, where R is a halogen. Acyls are formed from organic acids by replacing the hydroxyl group (OH) within the carboxyl group (COOH) with a halogen. For example, acetyl chloride (CH3COCl) is formed by replacing the hydroxyl group of acetic acid (CH3COOH) with a chlorine atom. The names of acyls are formed by replacing the suffix -ic of the acid's name with -yl.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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