The story
- Ancient Greek · derived fromκαυστικός“burning”
- Latin · borrowed fromcausticus“burning”
- English todaycaustic
From the Latin causticus (“burning”), from Ancient Greek καυστικός (kaustikós, “burning”), from καυστός (kaustós, “burnt”) + -ικός (-ikós).
Etymology from Wiktionary, CC BY-SA 4.0.