The Collaborative International Dictionary of English v.0.48:

cedar \ce"dar\ (s[=e]"d[~e]r), n. [AS. ceder, fr. L. cedrus, Gr.
   ke`dros.] (Bot.)
   The name of several evergreen trees. The wood is remarkable
   for its durability and fragrant odor.
   [1913 Webster]

   Note: The cedar of Lebanon is the Cedrus Libani; the white
         cedar (Cupressus thyoides) is now called
         Cham[oe]cyparis sph[ae]roidea; American red cedar is
         the Juniperus Virginiana; Spanish cedar, the West
         Indian Cedrela odorata. Many other trees with
         odoriferous wood are locally called cedar.
         [1913 Webster]