noun:

• gook (pejorative term for Koreans) - blend of チョン and チンカス - vulgar - slang - obscure term

noun:

• butterfly valve - obscure term ➜ バタフライバルブ

noun:

• extremely poor person - obscure term - slang ➜ ビンバー・貧乏
• third degree poverty - obscure term - slang

noun:

• complex preposition - obscure term ➜ 群前置詞

noun:

• bullet wound; gunshot wound - obscure term ➜ 銃創

~と adverb / adverb:

• bawling; crying - obscure term - onomatopoeia

noun:

• scab (i.e. a strikebreaker) - obscure term ➜ スト破り

noun:

• doubles (tennis, etc.) - obscure term ➜ ダブルス

noun:

• Japanese zelkova (species of elm-like tree, Zelkowa serrata) - obscure term ➜ 欅

noun:

• quasi-negation (e.g. use of words like 'hardly', 'seldom', 'barely'); weak negation - obscure term - Linguistics term

noun:

• kidney punch - obscure term

noun:

• mistress; concubine - archaism - obscure term

noun:

• morin khuur (stringed musical instrument of Mongolian origin) - obscure term - From Mongolian ➜ 馬頭琴

noun:

• pitch accent - obscure term ➜ 高低アクセント

noun:

• stress accent - obscure term ➜ 強弱アクセント

noun:

• opening a door for a moment (esp. on the train, when someone's foot is stuck, etc.) - obscure term

noun:

• erector pili (muscle fiber attached to a hair follicle); erectores pilorum - obscure term ➜ 立毛筋

noun:

• Prussian blue - obscure term ➜ プルシャンブルー

noun:

• Inverness cape - obscure term

noun:

• Oceania - obscure term ➜ 大洋州

noun / prefix noun:

• youth; freshness; purity; luster (lustre); beauty ［みず］ - archaism

noun:

• good omen

noun / prefix noun / suffix noun:

• Sweden ［ずい］ - abbreviation - obscure term
• Switzerland ［ずい］ - abbreviation - obscure term

noun:

• doorstep - obscure term

noun:

• involute - obscure term - Mathematics term ➜ インボリュート

noun:

• evolute - obscure term - Mathematics term ➜ エボリュート

noun:

• evolute curve - obscure term - Mathematics term