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空洞レンガ、空洞煉瓦、空胴煉瓦 くうどうれんが kuudourenga

JMdict entry #2872256

  1. noun (common) (futsuumeishi) civil engineering hollow brick (used for thermal isolation or moisture proofing)

Kanji in this word

空
empty, sky, void
洞
den, cave, excavation

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