"The name of many deities of the Semitic peoples" [Klein], late 14c., Biblical use is from Heb. Ba'al, lit. "owner, master, lord," from ba'al "he took possession of," also "he married;" related to Akkad. Belu (source of Heb. Bel), name of Marduk. Also related to the first element in Beelzebub. Used figuratively for any "false god."
1812, adherents of a conservative Jewish religious movement founded 1750 by Rabbi Israel ben Eliezer Baal Shem Tobh, from Heb. hasidhim, lit. "pious ones," pl. of hasidh "kind, pious." Earlier used in Heb. of adherents of an anti-Hellenistic faction during the time of the Maccabean Wars.