(linguistics) lengthening of the vowel of a single mora to produce two morae

Short for 呼吸器内科 (kokyūki naika, “respiratory medicine”).

(linguistics) sound shift / (linguistics) sound shifts from Old Japanese to Modern Japanese, especially those which are preserved in historical kana usage.

now / just now / soon

school (institution dedicated to teaching and learning)

physics, the physical aspects of a phenomenon or a system

(historical) Himikoko/Himikuku, a semi-legendary king of 狗奴国 (Kuna-koku, “Kuna/Kunu”)

(linguistics) a specific historical consonantal shift of the Japanese language during the Heian Period, wherein many word-medial /f/ sounds changed to /w/ sounds

(linguistics) a historical consonantal shift of the Japanese language involving the kana は/ハ (ha), ひ/ヒ (hi), ふ/フ (fu), へ/ヘ (he), and ほ/ホ (ho)

(generally) difference / (arithmetic) difference