Borrowing from Old French berfrey (changed to have an l by association with bell), from Middle High German  bërcvrit / bërvrit, possibly from Late Latin berefredus, borrowed from Proto-Germanic *bergafriþuz, from Proto-Indo-European *bʰerĝʰ, *bʰr̥ĝʰ + *prāy-, *prēy- (“to like, love”).
belfry (plural belfries)
- (obsolete) A movable tower used in sieges.
- (dialectal) A shed.
- (obsolete) An alarm-tower; a watchtower containing an alarm-bell.
- (architecture) A tower or steeple specifically for containing bells, especially as part of a church.
- (architecture) A part of a large tower or steeple, specifically for containing bells.
- "Belfry" in Michael Quinion, Ballyhoo, Buckaroo, and Spuds, 2004.