先駆者: trailblazer, pioneer

戦闘服: a battle or combat uniform: fatigues, battledress

新選組, 新撰組: Shinsengumi (special police force organized by the shogunate during the Bakumatsu period)

“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

(archaeology) the Bronze Age

cardiology, including the study of all circulatory organs

Kyūjitai form of 聴診器 (“stethoscope”)

(weaponry) flamethrower

filter (electronics or software to separate unwanted signal)

Synonym of メトロノーム (metoronōmu, “metronome”)