KJV Dictionary Definition: thy
THY, a. contracted from thine, or from some other derivative of thou. It is probable that the pronoun was originally thig, thug or thuk, and the adjective thigen. See Thou.
Thy is the adjective of thou, or a pronominal adjective, signifying of thee, or belonging to thee, like tuus in Latin. It is used in the solemn and grave style.
These are thy works, parent of good.
Thyine wood, a precious wood, mentioned Rev.18.