Perissodactyla :: Perissodactyla (n. pl.) A division of ungulate mammals, including those that have an odd number of toes, as the horse, tapir, and rhinoceros; -- opposed to Artiodactyla..
Rissoid :: Rissoid (n.) Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidae, found both in fresh and salt water..
Rissole :: Rissole (n.) A small ball of rich minced meat or fish, covered with pastry and fried..