Webster's English Dictionary

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thou

1. thou \(')thau.\ pn [ME, fr. OE thu-; akin to OHG du- thou, L tu, Gk sy)X 
   : the one addressed {~ shalt have no other gods before me -Exod  20:3 (AV)} 
   - used by Friends as the universal form of address to one person
2. thou \'thau.\ vt : to address as thou 
3. thou \'thau.\ \'thau.z\ n or thou or thous [short for thousand] pl  : a 
   thousand of something (as dollars)