noun
smokehole on a traditional hearth
Refers to the opening or flue above a traditional Japanese cooking hearth (kamado) that lets smoke escape. Often part of a fixed earthen stove. The term is regional and somewhat old-fashioned; in modern contexts, 煙突 (chimney) or 換気口 (vent) are more common.
昔の家では、竈の上に竈突があって煙を外に出していた。
In old houses, there was a smokehole above the hearth to let the smoke out.
noun
traditional cooking hearth; kitchen furnace
Used in the Kyoto area to refer to the earthen cooking stove itself, not just the smokehole. This is a dialectal usage (Kyoto-ben). In standard Japanese, 竈 (かまど) is the common word for such a hearth.
京都の祖母の家には、まだ古い竈が残っている。
At my grandmother's house in Kyoto, there is still an old traditional hearth.
The origin is uncertain. The reading くど may be related to an old word for a hollow or passage. The kanji 竈 is a traditional character for a cooking stove or hearth.