noun

• (architecture) A tower or steeple typically containing bells, especially as part of a church.
  "“You know, this house does have a belfry filled with local bats. Maybe Laszlo went up there.” “Oh, so like my darling perverted husband, to sniff out the local bordello immediately upon arrival. [chuckles] Could you take me to the belfry?”"
• (architecture) A part of a large tower or steeple, specifically for containing bells.
  "From the belfries far and near the funereal deathbell tolled unceasingly while all around the gloomy precincts rolled the ominous warning of a hundred muffled drums punctuated by the hollow booming of pieces of ordnance."
• (dialectal) A shed.
• (obsolete) A movable tower used in sieges.