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The Collaborative International Dictionary
Yex

Yex \Yex\, v. i. [OE. [yogh]exen, yesken, AS. giscian to sob.] To hiccough. [Written also yox, yux.] [Obs. or Prov. Eng.]

He yexeth and he speaketh through the nose.
--Chaucer.

Yex

Yex \Yex\, n. [AS. geocsa a sobbing, hiccough. Cf. Yex, v. i.] A hiccough. [Written also yox, and yux.] [Obs. or Prov. Eng.] ``The excessive yex.''
--Holland.

Wiktionary
yex

vb. 1 (context archaic English) hiccup. 2 (context archaic English) belch or burp.