[uh-mee-noh, am-uh-noh]

adjective Chemistry.

containing the amino group.

Origin of amino

First recorded in 1900–05; independent use of amino-


a combining form used in the names of chemical compounds in which the amino group is present: aminobenzene.
Also -amine; especially before a vowel, amin-.

Origin of amino- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for amino

Contemporary Examples of amino

Historical Examples of amino

British Dictionary definitions for amino



(modifier) of, consisting of, or containing the group of atoms -NH 2amino group or radical; amino acid


combining form

indicating the presence of an amino groupaminobenzoic acid

Word Origin for amino-

from amine
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 amino


1887, as an element in compound words involving chemicals, from comb. form of amine. Amino acid is attested from 1898.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for amino


[ə-mēnō, ămə-nō′]


Relating to an amine or other compound containing an NH2 group combined with a nonacid organic radical.



Containing the radical NH2 combined with a nonacid organic radical:aminobenzoic acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for amino


[ə-mēnō, ămə-nō′]

Relating to an amine or other chemical compound that contains the group NH2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.