TABUN Meaning of TABUN in English ˈtäˌbu̇n noun( -s )Usage: often capitalized Etymology: German: a liquid organic phosphorus ester (CH 3 ) 2 NP(CN)O(OC 2 H 5 ) that acts as a nerve gas Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012