ETYMOLOGY
an earlier form of hiccup, another being hickock, both apparently with a diminutive formative -et, -ock
EXAMPLE
“… And it is good to caste cold water in the face of him that hath the hicket, and to threaten him, and so put him in feare, and to anger hym, or els to prouoke hym to heauynesse, for by these thinges the naturall heat is reuoked and fortified within, and causeth the hicket to cease. …”
From: A new booke entyteled The Regiment of Lyfe: with a syngular Treatise of the pestilence
By Jean Goeurot
Translated by Thomas Phaer, 1544
Lexicophilia 