amino

¹ American  

[uh-mee-noh, am-uh-noh] / əˈmi noʊ, ˈæm əˌnoʊ /

adjective

Chemistry.

1. containing the amino group.

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amino- ² American  

1. a combining form used in the names of chemical compounds in which the amino group is present.

   aminobenzene.

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amino ¹ British  

/ -ˈmiː-, əˈmaɪnəʊ /

noun

1. (modifier) of, consisting of, or containing the group of atoms -NH 2

   amino group or radical

   amino acid

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amino- ² British  

combining form

1. indicating the presence of an amino group

   aminobenzoic acid

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amino Scientific  

/ ə-mē′nō,ăm′ə-nō′ /

1. Relating to an amine or other chemical compound that contains the group NH ₂.

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Etymology

Origin of amino¹

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

Origin of amino-²

amine + -o-

Example Sentences

That’s despite few clinical studies supporting the effectiveness or safety of these peptides, which are amino acid chains meant to help regulate functions in the body and have become popular among fitness and longevity enthusiasts.

From Salon • Apr. 4, 2026

Ingest a small but powerful tab of L.A.-grown protein-rich amino acids optimized to enhance their longevity and fat-burning properties, and let the aminos take you away.

From Los Angeles Times • Apr. 1, 2026

Technically speaking, peptides are short chains of amino acids that act as messengers in the body.

From The Wall Street Journal • Mar. 22, 2026

It also includes L-theanine, an amino acid that naturally occurs in green tea, which is also understood to have a relaxing effect on the body to aid sleep.

From BBC • Mar. 5, 2026

Proteins are made of chains of amino acids.

From "The Gene" by Siddhartha Mukherjee