caustic
https://gyazo.com/c7834e870df8c0924f66c161cbda06e2
adjective
1. able to burn or corrode organic tissue by chemical action:
〖名詞の前で〗苛性の, 腐食性の〈薬品など〉
e.g. a caustic cleaner.
2. sarcastic in a scathing and bitter way:
〈批判が〉痛烈な, 手厳しい
e.g. the players were making caustic comments about the refereeing.
3. Physics formed by the intersection of reflected or refracted parallel rays from a curved surface.
〘数〙 焦線［火線］の
noun
1. a caustic substance.
腐食剤
2. Physics a caustic surface or curve.
DERIVATIVES
caustically |ˈkôstək(ə)lē| adverb
causticity |kôˈstisədē| noun
ORIGIN
late Middle English: via Latin from Greek kaustikos, from kaustos ‘combustible’, from kaiein ‘to burn’.