What is the meaning of þi?

second-person singular possessive determiner: thy, your

alternative form of þe (“the”)

alternative form of þe (“thee”)

alternative form of þei (“they”)

alternative form of þe (“the”)

alternative form of þigh (“thigh”)

alternative form of þȳ

alternative form of þȳ

alternative form of þȳ

Source: wiktionary.org