A polymer in which the constituent monomer is a ribonucleotide (as in RNA).
1950s; earliest use found in Nature: a weekly journal of science. From poly- + ribonucleotide.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。