Pleurocentrum :: Pleurocentrum (n.) One of the lateral elements in the centra of the vertebrae in some fossil batrachians.
Urocele :: Urocele (n.) A morbid swelling of the scrotum due to extravasation of urine into it.
Urocerata :: Urocerata (n. pl.) A division of boring Hymenoptera, including Tremex and allied genera. See Illust. of Horntail..