The Collaborative International Dictionary of English v.0.48:

Sycamore \Syc"a*more\, n. [L. sycomorus, Gr. ? the fig mulberry;
   ? a fig + ? the black mulberry; or perhaps of Semitic origin:
   cf. F. sycomore. Cf. Mulberry.] (Bot.)
   (a) A large tree (Ficus Sycomorus) allied to the common
       fig. It is found in Egypt and Syria, and is the sycamore,
       or sycamine, of Scripture.
   (b) The American plane tree, or buttonwood.
   (c) A large European species of maple (Acer
       Pseudo-Platanus). [Written sometimes sycomore.]
       [1913 Webster]