Source : Webster's Revised Unabridged Dictionary (1913)

Syringin \Sy*rin"gin\, n. (Chem.)
   A glucoside found in the bark of the lilac ({Syringa}) and
   extracted as a white crystalline substance; -- formerly
   called also {lilacin}.

Syringa \Sy*rin"ga\, n. [NL., fr. Gr. ?, ?, a shepherd's pipe,
   tube. Cf. {Syringe}.] (Bot.)
   (a) A genus of plants; the lilac.
   (b) The mock orange; -- popularly so called because its stems
       were formerly used as pipestems.

Source : WordNet®

syringa
     n 1: large hardy shrub with showy and strongly fragrant
          creamy-white flowers in short terminal racemes [syn: {mock
          orange}, {Philadelphus coronarius}]
     2: genus of Old World shrubs or low trees having fragrant
        flowers in showy panicles: lilacs [syn: {genus Syringa}]