Besserwisser

Etymology
Borrowed from.

Noun

 * 1) A know-it-all, wiseguy, wiseacre, smart aleck.
 * 2) * 1993, Ullica Segerstråle, Bringing the Scientist Back In, in the anthology Controversial science: from content to contention (Thomas Brante, Steve Fuller, William Lynch, editors):
 * There is an authoritarian ring to many of the new approaches to the sociology of scientific knowledge, a Besserwisser attitude, whereby the sociologist knows best and does not need to consult with the object of his or her study.
 * There is an authoritarian ring to many of the new approaches to the sociology of scientific knowledge, a Besserwisser attitude, whereby the sociologist knows best and does not need to consult with the object of his or her study.

Etymology
Compound of.

Noun

 * 1)  know-it-all, wiseguy, wiseacre, smart aleck