Source : Webster's Revised Unabridged Dictionary (1913)

Wert \Wert\ (w[~e]rt),
   The second person singular, indicative and subjunctive moods,
   imperfect tense, of the verb be. It is formed from were, with
   the ending -t, after the analogy of wast. Now used only in
   solemn or poetic style.

Wert \Wert\, n.
   A wart. [Obs.] --Chaucer.