The Collaborative International Dictionary of English v.0.48:

Spiroylic \Spi*royl"ic\, Spiroylous \Spi*royl"ous\, a. [NL.
   Spir? meadowsweet (a source of salicylal) + -yl + -ic, -ous.]
   (Chem.)
   Pertaining to, or designating, a substance now called
   salicylal. [Obs.]
   [1913 Webster]