The Collaborative International Dictionary
Wanion
Wanion \Wan"ion\, n. [Probably for OE. waniand waning, p. pr. of
wanien; hence, used of the waning of the moon, supposed to be
an unlucky time. See Wane.]
A word of uncertain signification, used only in the phrase
with a wanion, apparently equivalent to with a vengeance,
with a plague, or with misfortune. [Obs.]
--B. Jonson.
Latimer.
Wiktionary
wanion
n. 1 the wane of the moon 2 curse 3 (context obsolete English) vengeance