The Collaborative International Dictionary of English v.0.48:

Germander \Ger*man"der\, n. [OE. germaunder, F. germandr['e]e,
   It. calamandrea, L. chamaedrys, fr. Gr.?; ? on the earth or
   ground + ? tree. See Humble, and Tree.] (Bot.)
   A plant of the genus Teucrium (esp. Teucrium Cham[ae]drys
   or wall germander), mintlike herbs and low shrubs.
   [1913 Webster]

   American germander, Teucrium Canadense.

   Germander chickweed, Veronica agrestis.

   Water germander, Teucrium Scordium.

   Wood germander, Teucrium Scorodonia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

germander
    n 1: any of various plants of the genus Teucrium