The Collaborative International Dictionary
Backshish
Backsheesh \Back"sheesh`\, ||Backshish \Back"shish`\, n. [Pers. bakhsh[=i]sh, fr. bakhsh[=i]dan to give.] In Egypt and the Turkish empire, a relatively small amount of money given for services rendered (as by a waiter); a gratuity; a ``tip''.
Syn: gratuity, tip, baksheesh, bakshish, bakshis.
Wiktionary
backshish
n. (alternative spelling of baksheesh English)