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[uh-mee-noh, am-uh-noh] /əˈmi noʊ, ˈæm əˌnoʊ/
adjective, Chemistry
containing the amino group.
Origin of amino
1900-05; independent use of amino-


a combining form used in the names of chemical compounds in which the amino group is present:
Also, -amine; especially before a vowel, amin-.
Origin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for amino
  • It is a complete amino acid and is unusually high in protein for a seed.
  • It's a fact that asparagus, a member of the lily family, contains the sulfurous amino acid methionine.
  • Proteins are made up of amino acids, some that are attracted to water, others that are repelled by water.
  • They re-supply the body with carbohydrates, usually antioxidants and sometimes amino acids and caffeine.
  • The proteins of barnacle glue, they discovered, are dominated by amino acids called proline and isoleucine.
  • Proteins are complicated chemicals made of long chains of amino acids, the tiny chemical building blocks of life.
  • The protein in question contains a lot of an amino acid called histidine.
  • amino-acids, the building blocks of proteins, are left-handed.
  • In addition, secondary protein breakdown paths for amino acids to convert to sugar derivatives occur.
  • To make proteins, the human body needs twenty different kinds of amino acids.
British Dictionary definitions for amino


/əˈmaɪnəʊ; -ˈmiː-/
(modifier) of, consisting of, or containing the group of atoms -NH2: amino group or radical, amino acid


combining form
indicating the presence of an amino group: aminobenzoic acid
Word Origin
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
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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
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amino in Medicine

amino a·mi·no (ə-mē'nō, ām'ə-nō')
Relating to an amine or other compound containing an NH2 group combined with a nonacid organic radical.

amino- pref.
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.
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amino in Science
  (ə-mē'nō, ām'ə-nō')   
Relating to an amine or other chemical compound that contains the group NH2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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