barium
バリウム
解説 Definition
barium は、化学元素のバリウムを表す名詞です。日本語の「バリウム」は健康診断で飲む造影剤を指すことが多いですが、英語の barium は元素そのものやその化合物も指します。
A soft, silvery chemical element with atomic number 56 and the symbol Ba. It is highly reactive and is usually found or used in compounds; barium sulfate is commonly employed as a contrast medium in medical imaging.
覚え方のコツ Memory Tip
barium は元素記号 Ba、原子番号56の金属元素。語源のギリシャ語 barys「重い」と、元素名に多い -ium を結び付ける。日本の検査で言う「バリウム」は通常、元素そのものではなく硫酸バリウムを含む造影剤なので、barium element、barium compound、barium test の範囲を区別する。
Connect barium with Greek barys, meaning “heavy,” and the common element ending -ium. Its symbol is Ba and its atomic number is 56. In Japanese health-check contexts, バリウム often means the drink used for imaging, but English barium primarily names the element and may also refer broadly to its compounds. The medical substance is usually barium sulfate, not free metallic barium. Remember three useful combinations: barium element for chemistry, barium compound in a laboratory, and barium test in medicine. This distinction prevents the everyday Japanese usage from narrowing the English meaning too much.
例文
Barium is a chemical element.
バリウムは化学元素です。
The doctor explained why barium was used in the test.
医師は検査でバリウムが使われる理由を説明しました。
The lab stored the barium compound according to safety rules.
その研究室は安全規則に従ってバリウム化合物を保管しました。
barium の類義語・関連語
派生語
紛らわしい語
barium の語源・成り立ち Etymology
1808年にデーヴィーが新ラテン語で命名した元素名。ギリシャ語 barys「重い」+ 元素名語尾 -ium から成り、重晶石 barytes に含まれる金属だったため「重いものの元素」と理解できる。関連語は bariatric, barometer。
Barium was named in the early nineteenth century by Humphry Davy after he isolated the element. The name was formed in New Latin from Greek barys, meaning “heavy,” plus the element-name ending -ium. It refers to the notably heavy mineral then called baryta or barytes from which barium compounds were obtained. The same Greek base appears in scientific vocabulary associated with weight or pressure, although barium is specifically the name of the metallic element.
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