The Collaborative International Dictionary of English v.0.48:

Snore \Snore\ (sn[=o]r), v. i. [imp. & p. p. Snored
   (sn[=o]rd); p. pr. & vb. n. Snoring.] [OE. snoren, AS.
   snora a snoring; akin to LG. snoren, snorken, snurken, to
   snore, D. snorken, G. schnarchen to snore, schnarren to
   rattle, MHG. snarren, Sw. snarka to snore, Icel. snarka to
   sputter, fizzle. Cf. Snarl to growl, Sneer, Snort. See
   Snoring.]
   To breathe with a rough, hoarse, nasal voice in sleep.
   [1913 Webster]