acid
https://gyazo.com/7868bb5e4da80ee59e6bcd34dc86e56c
source: litmus test for acid – 10 Minute School: JSC Section
noun
1. a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind. Often contrasted with alkali and base1:
〖具体例では可算〗〘化〙 酸(↔ alkali)
e.g. traces of acid
e.g. rainwater is a very weak acid.
bitter or cutting remarks or tone of voice:
厳しい批判［言葉, 意見］
e.g. she was unable to quell the acid in her voice.
2. Chemistry a molecule or other entity that can donate a proton or accept an electron pair in reactions.
3. informal the drug LSD.
｟俗｠ LSD〘幻覚作用を持つ麻薬〙
Acids are compounds that release hydrogen ions (H+) when dissolved in water. Any solution with a pH of less than 7 is acidic, strong acids such as sulfuric or hydrochloric acid having a pH as low as 1 or 2. Most organic acids (carboxylic or fatty acids) contain the carboxyl group −COOH.
adjective
1. containing acid or having the properties of an acid; having a pH of less than 7. Often contrasted with alkaline or basic:
〘化〙 酸性の(↔ alkaline)
e.g. poor, acid soils.
2. sharp-tasting or sour:
〈食品などが〉酸味のある, すっぱい(→ sour)
e.g. acid fruit.
(of a person's remarks or tone) bitter or cutting.
〈発言･調子･ユーモアなどが〉批判的［辛辣, 嘲笑的］な; 〈状況などが〉過酷な, きつい
(of a color) intense or bright:
〈色などが〉どぎつい
e.g. an acid green.
3. Geology (of rock, especially lava) containing a relatively high proportion of silica.
〘地〙 〈土が〉ケイ土を含む
Metallurgy relating to or denoting steelmaking processes involving silica-rich refractories and slags.
DERIVATIVES
acidy adjective
ORIGIN
early 17th century (in the sense ‘sour-tasting’): from Latin acidus, from acere ‘be sour’.