絕學 [绝学]

Jyutping zyut6 hok6
Pinyin jué xué

Definitions (CC-CANTO)
  1. (adjective) profound knowledge; or (verb) drop out from a school
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. noun, literary
    lost body of knowledge
  2. noun, literary
    profound learning
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）