• Webster's Revised Unabridged Dictionary
    • n Mastress Mistress.
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Century Dictionary and Cyclopedia
    • n mastress An obsolete form of mistress.
    • ***


In literature:

And when she sawe that she had conceyved hyr mastresse was despised in hyr syghte.
"The First Boke of Moses called Genesis" by William Tyndale
My right wurshipful mastresse, Almyghti Jesu kepe you.
"The Paston Letters, Volume III (of 6)"