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}.] {Poly mountain}. See {Poly-mountain}, in Vocabulary.