Added 9 October 2026 rbc noun Categories: The BodyRare Words noun ! Definition from WordNet 3.1, Princeton University. More about rbc at Wordnik → Where our words come from → A mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus. Related Words: rbmsvcbrccorasccbrscotiacpracbcellsdegreesdiscs Back to today's word