The Collaborative International Dictionary of English v.0.48:

Tho \Tho\ ([th][=o]), def. art.
   The. [Obs.] --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Tho \Tho\, pron. pl.
   Those. [Obs.]
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         This knowen tho that be to wives bound.  --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Tho \Tho\, adv. [AS. [thorn][=a].]
   Then. [Obs.] --Spenser.
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         To do obsequies as was tho the guise.    --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Tho \Tho\, conj.
   Though. [Reformed spelling.]
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WordNet (r) 3.0 (2006):

Tho
    n 1: a branch of the Tai languages