Also -amine; especially before a vowel, amin-.

Origin of amino- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for amino-


combining form
  1. 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

amino- in Medicine


  1. 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.