Definition of thou pronoun from the Oxford Advanced Learner's Dictionary

 

thou

 pronoun
pronoun
BrE BrE//ðaʊ//
 
; NAmE NAmE//ðaʊ//
 
(old use or dialect)
 
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a word meaning ‘you’, used when talking to only one person who is the subject of the verb compare thee Word Origin Old English thu, of Germanic origin; related to German du, from an Indo-European root shared by Latin tu.
See the Oxford Advanced American Dictionary entry: thou