The Collaborative International Dictionary
Medicaster
Medicaster \Med"i*cas`ter\, n. [Cf. F. m['e]dicastre. See
Medical.]
A quack. [R.]
--Whitlock.
Douglas Harper's Etymology Dictionary
medicaster
"quack," c.1600, from Latin *medicaster (source also of Italian medicastro, French médicastre, 16c.), from medicus (see medical (adj.)). The feminine form is medicastra. Compare also -aster.\n
Wiktionary
medicaster
n. a quack doctor; someone who pretends to have medical knowledge
Usage examples of "medicaster".
The man is known the world over as a sciolist, a medicaster, a humbug, a hoaxster, a trepan, a—"