polyribonucleotide
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pol·y·ri·bo·nu·cle·o·tide
(pŏl′ē-rī′bō-no͞o′klē-ə-tīd′, -nyo͞o′-)n.
An oligonucleotide consisting of a number of ribonucleotides.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.