[ 'wʌɪz(ə)nˌhʌɪmə ]
■ noun US informal a person who pretends to be wise or knowledgeable; a wiseacre.
Origin
early 20th cent.: from wise 1 + the suffix -(n)heimer found in surnames such as Oppenheimer .
WISENHEIMER
Meaning of WISENHEIMER in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004