Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An amino acid, C6H13N3O3, originally isolated from watermelon, that is produced as an intermediate in the conversion of ornithine to arginine during urea formation in the liver.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An amino acid, first isolated from watermelons, that is an intermediate in the urea cycle

from the GNU version of the Collaborative International Dictionary of English

  • n. an amino acid that is an intermediate in the conversion of ornithine to arginine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine

Etymologies

New Latin Citrullus, watermelon genus (from Medieval Latin citrullus, watermelon, from Italian dialectal citrulo, from Late Latin citrium, from Latin citrus, citron) + -ine2.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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