An Etymological Dictionary of Astronomy and Astrophysics

On who pretends to be what he is not.

Etymology (EN): M.Fr. imposteur, from L.L. impostor, agent noun from impostus, from imponere “to place upon, impose upon, deceive,” from → in- “into, in, on, upon” + ponere “to put place,” → position.

Etymology (PE): Daqalkâr, from daqal “imposture, deceit” + -kâr, agent noun suffix, from kardan, → -or.