ホトマルMeanings1nounphoto multiplierabbreviationAbbreviation of フォトマルチプライヤー, used in technical contexts such as physics and electronics.この実じっ験けんではホトマルを使つかって微び弱じゃくな光ひかりを検けん出しゅつします。In this experiment, we use a photo multiplier to detect faint light.