Kyūjitai form of 黒煙: black smoke

(dialectal, Edo, Tōhoku) you (standard second-person pronoun)

(mathematics) pi

to restrain oneself; to have restraint; to be reserved; to hold back / to refrain from (doing something) / to stand on ceremony

ＣＭ: commercial on TV, ad

a still image shown for around five seconds at the end of an anime airing, appearing after the ending credits and next episode preview

a bookend, a pair of bookends

bismuth

(organic chemistry) citrate

Synonym of シアン化物 (shian kabutsu, “cyanide”) (chemistry: any compound containing the CN group)