thou'rt

• (General American) IPA^(key): /ðaʊɹt/
• (Received Pronunciation) IPA^(key): /ðaʊət/, /ðɑːt/

thou’rt

1. (archaic) Contraction of thou art.
   • 17th century - Abraham Cowley, Against Fruition

     No; thou’rt a fool, I'll swear, if e’re thou grant;

     Much of my veneration thou must want,

     When once thy kindness puts my ignorance out;

     For a learn’d Age is always least devout.