English Dictionary

alum

IPA（発音記号）

/ˈæl.əm/

名詞

可算名詞 不可算名詞

An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O).

日本語の意味

染色や鞣し、特定の医薬品に利用される収れん作用を持つ塩。日本語では一般的に『明礬（みょうたん）』と呼ばれる化学物質です。 / 化学的には、カリウムとアルミニウムの二重硫酸塩（K₂SO₄·Al₂(SO₄)₃·24H₂O）として知られ、染色・鞣しの際の媒介剤や収斂剤として使用されます。

The dyers used alum to fix the color on the wool before rinsing it.

染色職人たちは、洗い流す前にウールの色を定着させるためにミョウバンを使った。

意味（1）

An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O).

Venice also needed alum for trade, since it was the point of departure for overland transportation of alum to southern Germany and its cloth-manufacturing Free Cities.

意味（2）

(chemistry) Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.

With weld and cochineal, which are colouring matters the most sensible to the action of sulphate of iron, the purified alums gave us colours more brilliant, fresh, and in a slight degree lighter; while those with our common alums were all duller, and evidently of a deeper hue.

alums （ plural ）