黒ぼく くろぼく Also written くろぼこ, 黒ぼこ Meanings Noun crumbly black topsoil See also: 穆穆 (ぼくぼく). porous hardened lava Kanji 黒 black. Read as くろ. Words containing 黒ぼく 黒ぼく土 (くろぼくど) crumbly black topsoil (esp. from weathered volcanic ash) Jinuma: Japanese Dictionary · Word lists