(Japanese mythology) the first of the sons of 天照 (Amaterasu) (along with 天穂日 (Ama no Hohi), 天津彦根 (Amatsuhikone), 活津彦根 (Ikutsuhikone) and 熊野櫲樟日 (Kumanokusuhi)) who were given birth by 素戔嗚 (Susa no O) by chewing her jewels during the 誓約 (ukei, “oath”) to test his intent seeking refuge in her heavenly domain (the five sons were hers; the three daughters she gave birth to were his); he was sent by his mother to rule the land of 葦原の中つ国 (Ashihara no Nakatsukuni), but ultimately he recommended his son 瓊瓊杵 (Ninigi) instead

Obsolete spelling of アルプス (Arupusu, “Alps (a mountain range in Western Europe)”)

(figuratively) a narrow world view based on limited experience

an ordinary person cannot understand the ambitions of a great man

(historical) Hunmin Jeongeum (document introducing the Hangul script for Korean in 1446)

(physics) infrasound

(phonetics) debuccalization

(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)