The Collaborative International Dictionary of English v.0.48:

Basyle \Bas"yle\ (b[a^]s"[i^]l or b[=a]s"[i^]l), n. [Gr. ba`sis
   base + "y`lh wood. See -yl.] (Chem.)
   A positive or nonacid constituent of compound, either
   elementary, or, if compound, performing the functions of an
   element.
   [1913 Webster]