Webster's Revised Unabridged Dictionary · 1913

Yex

Yex , intransitive verb

[Old English yexen, yesken, Anglo-Saxon giscian to sob.]

To hiccough. [Obsolete or Provincial English]
He yexeth and he speaketh through the nose. — Chaucer

Yex , noun

[Anglo-Saxon geocsa a sobbing, hiccough. Compare Yex, v. i.]

A hiccough. [Obsolete or Provincial English]
The excessive yex. — Holland