The Collaborative International Dictionary of English v.0.48:

Linden \Lin"den\ (l[i^]n"den), n. [Orig. an adj. from lind
   linden tree, AS. lind; akin to D. & G. linde, OHG. linta,
   Icel., Sw., & Dan. lind. Cf. Lime linden.] (Bot.)
   (a) A handsome tree (Tilia Europ[ae]a), having cymes of
       light yellow flowers, and large cordate leaves. The tree
       is common in Europe.
   (b) In America, the basswood, or Tilia Americana.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Basswood \Bass"wood`\, n. (Bot.)
   The bass (Tilia) or its wood; especially, Tilia
   Americana. See Bass, the lime tree.
   [1913 Webster]

         All the bowls were made of basswood,
         White and polished very smoothly.        --Longfellow.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Tilia americana
    n 1: large American shade tree with large dark green leaves and
         rounded crown [syn: American basswood, American lime,
         Tilia americana]