yourn

or your'n

[yoo rn, yawrn, yohrn]

Origin of yourn

1350–1400; Middle English, equivalent to your + -n, as in mine1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for your'n

yourn

dialectal possessive pronoun from your, attested from late 14c. See her.

Online Etymology Dictionary, © 2010 Douglas Harper