The Collaborative International Dictionary of English v.0.48:

Alkalize \Al"ka*lize\ ([a^]l"k[.a]*l[imac]z), v. t. [imp. & p.
   p. Alkalized ([a^]l"k[.a]*l[imac]zd); p. pr. & vb. n.
   Alkalizing ([a^]l"k[.a]*l[imac]`z[i^]ng).] [Cf. F.
   alcaliser.]
   To render alkaline; to communicate the properties of an
   alkali to.
   [1913 Webster] Alkaloid