riboflavin

n [U] vitamin B2, which is found in meat, fish, milk and green vegetables, and also produced synthetically, and which helps growth in man 核黄素.

rhododendron, rhomboid, rhombus, rhubarb, rhyme, rhymed, rhyming slang, rhythm, rhythm and blues, rhythm method, rhythmic, rhythmically, RI, rib, rib-cage, rib-tickling, ribald, ribaldry, ribbon, ribbon development, rice, rice-paper, rich, riches, richly, richness, Richter scale, rick, rickets, rickety, rickshaw, ricochet, rid, riddance, ridden, riddle, ride, ride down, ride off, ride on,