ねずみ算 ねずみざん Also written ネズミざん, ねずみさん, 鼠算, ネズミ算 Meanings Noun geometric progression proliferation; multiplying like rats Kanji 算 calculate. Read as サン. Words containing ねずみ算 ねずみ算式 (ねずみざんしき) exponential growth Jinuma: Japanese Dictionary · Word lists