掘りごたつ、掘り炬燵、掘り火燵、掘炬燵、掘火燵
ほりごたつ
horigotatsu
JMdict entry #1664450
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noun (common) (futsuumeishi)
sunken kotatsu; low table over a hole in the floor (may have a heat source underneath and a hanging quilt to retain warmth)
see: 炬燵