The Collaborative International Dictionary of English v.0.48:

Savory \Sa"vo*ry\ (s[=a]"v[-o]*r[y^]), n. [F. savor['e]e; cf.
   It. santoreggia, satureja, L. satureia,] (Bot.)
   An aromatic labiate plant (Satureia hortensis), much used
   in cooking; -- also called summer savory. [Written also
   savoury.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

summer savory
    n 1: erect annual herb with oval leaves and pink flowers; used
         to flavor e.g. meats or soups or salads; southeastern
         Europe and naturalized elsewhere [syn: summer savory,
         Satureja hortensis, Satureia hortensis]
    2: herb with delicately flavored leaves with many uses [syn:
       summer savory, summer savoury]