白亜 はくあ Also written 白堊 Meanings Noun chalk (rock) white wall Kanji 白 white. Read as ハク. 亜 sub-. Read as ア. Words containing 白亜 白亜紀 (はくあき) Cretaceous period 白亜質 (はくあしつ) cementum 白亜館 (はくあかん) White House And 1 more. Jinuma: Japanese Dictionary · Word lists