The Collaborative International Dictionary
Snithy
Snithe \Snithe\, Snithy \Snith"y\, a. [AS. sn[=i][eth]an to cut. See Snathe.] Sharp; piercing; cutting; -- applied to the wind. [Prov. Eng.]
Wiktionary
snithy
a. 1 sharp; cutting. 2 (context of wind or weather English) cold.