Definition of yourn in English:

yourn

possessive pronoun

regional or archaic form of yours
‘he were yourn, you kept saying’
regional or archaic form of yours
  • ‘Don't they teach you respect at that school of yourn?’
  • ‘What's the nature of this venture of yourn?’
  • ‘If my cup won't hold but a pint and yourn holds a quart, wouldn't ye be mean not to let me have my little half-measure full?’

Pronunciation

yourn

/jɔːn/ /jʊən/