Definition of "thine" []

• Used to indicate the one or ones belonging to thee. (pronoun)
• Used instead of thy before an initial vowel or h: "The presidential candidates are practicing the first rule of warfare: know thine enemy” ( Eleanor Clift). (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Before a noun beginning with a vowel thine and mine are commonly substituted for thy and my, as in “thine eyes” and “mine infirmity."
• "Be not wise in thine own eyes; fear the LORD, and depart from all evil."
• "Thou shalt not hate thy brother in thine heart: thou shalt in any wise rebuke [reason with] thy neighbour, and not suffer sin upon him."