# guanine

> English word · Noun · IPA /ˈɡwɑː.niːn/ · frequency rank #66,698

## Definitions
1. A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA (by means of three hydrogen bonds).

## Etymology
From guano + -ine. Guanine was named by the German chemist Julius Bodo Unger in 1846 who isolated it from guano.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/guanine