Source : Webster's Revised Unabridged Dictionary (1913)

Yacca \Yac"ca\ (y[a^]k"k[.a]), n. (Bot.)
   A West Indian name for two large timber trees ({Podocarpus
   coriaceus}, and {P. Purdicanus}) of the Yew family. The wood,
   which is much used, is pale brownish with darker streaks.

Source : WordNet®

Podocarpus coriaceus
     n : West Indian evergreen with medium to long leaves [syn: {yacca},
          {yacca podocarp}]