racetrack tout
— Noun
– English
～ someone who offers advice about betting on horses (either to influence the odds or in the hope of sharing some of the winnings)
rope tow
— Noun
– English
～ a ski tow offering only a moving rope to hold onto
regression toward the mean
— Noun
– English
～ the relation between selected values of x and observed values of y (from which the most probable value of y can be predicted for any value of x)
roller towel
— Noun
– English
～ a towel with the ends sewn together, hung on a roller
Rhus toxicodenedron
— Noun
– English
～ poisonous shrub of southeastern United States causing a rash on contact
ricin toxin
— Noun
– English
～ a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon; "one milligram of ricin can kill an adult"