The Collaborative International Dictionary of English v.0.48:

Poly \Po"ly\, n. [L. polium, the name of a plant, perhaps
   Teucrium polium, Gr. ?.] (Bot.)
   A whitish woolly plant (Teucrium Polium) of the order
   Labiat[ae], found throughout the Mediterranean region. The
   name, with sundry prefixes, is sometimes given to other
   related species of the same genus. [Spelt also poley.]
   [1913 Webster]

   Poly mountain. See Poly-mountain, in Vocabulary.
      [1913 Webster]