The Collaborative International Dictionary of English v.0.48:

Poly- \Pol"y-\ [See Full, a.]
   A combining form or prefix from Gr. poly`s, many; as,
   polygon, a figure of many angles; polyatomic, having many
   atoms; polychord, polyconic.
   [1913 Webster]

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]

The Free On-line Dictionary of Computing (30 December 2018):

Poly

    1. A polymorphic, block-structured language
   developed by D.C.J. Matthews at Cambridge in the early 1980s.

   ["An Overview of the Poly Programming Language", D.C.J.
   Matthews, in Data Types and Persistence,
   M.P. Atkinson et al eds, Springer 1988].

   2. A language developed at St Andrews University, Scotland.

   [Software Practice & Exp, Oct 1986].

   3. A polymorphic language used in the referenced book.

   ["Polymorphic Programming Languages", David M. Harland, Ellis
   Horwood 1984].

   (2000-11-07)