noun
lamp chimney
Refers to the glass tube or globe that surrounds the flame of an oil lamp or lantern.
ランプの火屋が割れてしまった。
The lamp chimney broke.
Compound of 火 (hi, 'fire') and 屋 (ya, 'house, roof, covering'), literally 'fire covering'. The reading ほや is a sound shift from hi-ya.