Dictionary![]() ![]() ri•bo•nu•cle•o•sidePronunciation: (rī"bō-nOO'klē-u-sīd", -nyOO'-), [key] —n. Biochem. a ribonucleotide precursor that contains ribose and a purine or pyrimidine base. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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