Search ribosomal RNA (rRNA) ribosomal RNA (rRNA) /rī′bōsō″məl/ , the ribonucleic acid of ribosomes and polyribosomes. Tweet Telegram VK Random Words Child Occupational Self-Assessment (COSA) plane American Nurses Association—Political Action Committee (ANA-PAC) Snellen’s reflex Henoch-Schönlein syndrome associative play sodium bicarbonate bracketing pro-