Zen
来自Big Physics
Japanese, literally ‘meditation’, from Chinese chán ‘quietude’, from Sanskrit dhyāna ‘meditation’.
wiktionary
From Japanese 禅(ぜん)(zen), from Middle Chinese 禪 (MC d͡ʑiᴇn) (compare Mandarin 禅 (Chán), an abbreviation of 禪那 (MC d͡ʑiᴇn nɑ), from Sanskrit ध्यान(dhyāna, “a type of meditation”). Akin to dhyana.
etymonline
Zen (n.)
school of Mahayana Buddhism, 1727, from Japanese, from Chinese ch'an, ultimately from Sanskrit dhyana "thought, meditation," from PIE root *dheie- "to see, look" (source also of Greek sema "sign, mark, token"). As an adjective from 1881.