warlock

[wawr-lok] /ˈwɔrˌlɒk/
noun
1.
a man who professes or is supposed to practice magic or sorcery; a male witch; sorcerer.
2.
a fortuneteller or conjurer.
Origin
before 900; Middle English warloghe, -lach, Old English wǣrloga oathbreaker, devil, equivalent to wǣr covenant + -loga betrayer (derivative of lēogan to lie)
Examples from the web for warlock
  • Then he hurried to the warlock's castle, but only to learn from the princess that the warlock was still alive.
British Dictionary definitions for warlock

warlock

/ˈwɔːˌlɒk/
noun
1.
a man who practises black magic; sorcerer
2.
a fortune-teller, conjuror, or magician
Word Origin
Old English wǣrloga oath breaker, from wǣr oath + -loga liar, from lēogan to lie1

Warlock

/ˈwɔːˌlɒk/
noun
1.
Peter, real name Philip Arnold Heseltine. 1894–1930, British composer and scholar of early English music. His works include song cycles, such as The Curlew (1920–22), and the Capriol Suite (1926) for strings
Word Origin and History for warlock
n.

Old English wærloga "traitor, liar, enemy," from wær "faith, a compact" (cf. Old High German wara "truth," Old Norse varar "solemn promise, vow;" see very; cf. also Varangian) + agent noun related to leogan "to lie" (see lie (v.1)).

Original primary sense seems to have been "oath-breaker;" given special application to the devil (c.1000), but also used of giants and cannibals. Meaning "one in league with the devil" is recorded from c.1300. Ending in -ck and meaning "male equivalent of a witch" (1560s) are from Scottish.