Cos·tel·lo 
(kŏs-tĕlō), Lou Originally Louis Francis Cristillo. 1906-1959.
(kŏs-tĕlō), Lou Originally Louis Francis Cristillo. 1906-1959. American comedian. As part of the Abbott and Costello comedy team he made a number of films, including Buck Privates (1941) and Abbott and Costello Meet Frankenstein (1948).