From Middle English snoren, fnoren, from Middle English snore, *fnore, from Old English fnora, from Proto-Germanic *fnuzô, from Proto-Indo-European *pnew-. Compare also Proto-Germanic *snarkjaną, Middle Low German snorren, Dutch snorren.
The change fn → sn in this word is regular, seen also in sneeze, from Middle English fnesen (see that entry for more).
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