Etymology 1
From Old English þes, þæs, þēos, þis, þys, all ultimately from inflections of Proto-Germanic *sa (“that”).
Determiner
þis (feminine þeos, accusative þisne, dative þissum, genitive þisses)
- this[3]
- þys, þise, þisse, þyse, þysse, þes, þese, þeis, þeise, þeys, þeyse, þeose, þus, dis
- þues, þusse (Southwest); yis (Northern, East Anglia)
- þisse, þysse, þies, þyes, þesse, þæs, þos (Early Middle English)
- tis, tys, tisse, tysse, tes, teos (after dentals)
References
Brink, Daniel (1992) “Variation between <þ-> and <t-> in the Ormulum”, in Irmengard Rauch, Gerald F. Carr and Robert L. Kyes, editors, On Germanic Linguistics: Issues and Methods (Trends in Linguistics. Studies and Monographs; 68), De Gruyter Mouton, →DOI, →ISBN, pages 21-35.
Etymology 2
Determiner
þis
- Alternative form of þes (“these”)
Pronoun
þis
- Alternative form of þes (“these”)