from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA.
from The Century Dictionary and Cyclopedia
- n. A substance (C5H5N5O) contained in guano.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a purine base found in DNA and RNA; pairs with cytosine
From guano, in which it is found.(American Heritage® Dictionary of the English Language, Fourth Edition)
From guano + -ine. (Wiktionary)