rain stick
— Noun
– English
～ a percussion instrument that is made from a dried cactus branch that is hollowed out and filled with small pebbles and capped at both ends; makes the sound of falling rain when tilted; origin was in Chile where tribesmen used it in ceremonies to bring rain
reinforcing stimulus
— Noun
– English
～ (psychology) a stimulus that strengthens or weakens the behavior that produced it
roughtail stingray
— Noun
– English
～ one of the largest stingrays; found from Cape Cod to Cape Hatteras
raise a stink
— Verb
– English
～ take strong and forceful action, as to object or express discontent; "She raised hell when she found out that she wold not be hired again"
running stitch
— Noun
– English
～ small, even, hand stitches run in and out
reacquired stock
— Noun
– English
～ stock that has been bought back by the issuing corporation and is available for retirement or resale; it is issued but not outstanding; it cannot vote and pays no dividends
reverse stock split
— Noun
– English
～ a decrease in the number of outstanding shares of a corporation without changing the shareholders' equity
rolling stock
— Noun
– English
～ collection of wheeled vehicles owned by a railroad or motor carrier
rayon stocking
— Noun
– English
～ women's stockings made from a sheer material (nylon or rayon or silk)
Rhizopus stolonifer
— Noun
– English
～ fungus causing soft watery rot in fruits and vegetables and rings of dry rot around roots of sweet potatoes
Rosetta Stone
— Noun
– English
～ a part of an inscribed granite stela that was originally about six feet tall and was set up in 196 BC; the inscriptions in hieroglyphics and Demotic and Greek gave the first clues to the decipherment of Egyptian hieroglyphics
rest stop
— Noun
– English
～ designated paved area beside a main road where cars can stop temporarily
reed stop
— Noun
– English
～ an organ stop with the tone of a reed instrument