What is the meaning of þou?

thou (second-person singular pronoun); you

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.

Thurber, Beverly A. (2011 February 15) “Voicing of Initial Interdental Fricatives in Early Middle English Function Words”, in Journal of Germanic Linguistics, volume 23, number 1, Cambridge University Press, →DOI, pages 65-81.

thou, pron.”, in MED Online, Ann Arbor, Mich.: University of Michigan, 2007, retrieved 5 May 2018.

Source: wiktionary.org