rheo-, rhea-, rhe-, rhy-

(Greek: a flow, wave; current of a stream, current; electrical current)

rheoxenous, rheoxene
Used of organisms that occur only occasionally in running water.
rhyme
rhyolite
rhysimeter
rhythmic
1. With a regularly recurring pattern or beat.
2. Relating to, or having rhythm; recurring with measured regularity.
rima (s), rimae (pl)
1. A slit or cleft, often an opening between two symmetrical parts or structures.
2. A slit or fissure, or narrow elongated opening between two symmetric parts.
terza rima