The Collaborative International Dictionary of English v.0.48:

Thyine wood \Thy"ine wood`\ [Gr. ? ?, fr. ?, adj., pertaining to
   the tree ? or ?, an African tree with sweet-smelling wood.]
   (Bot.)
   The fragrant and beautiful wood of a North African tree
   (Callitris quadrivalvis), formerly called Thuja
   articulata. The tree is of the Cedar family, and furnishes a
   balsamic resin called sandarach. --Rev. xviii. 12.
   [1913 Webster]

Easton's 1897 Bible Dictionary:

Thyine wood
   mentioned only in Rev. 18:12 among the articles which would
   cease to be purchased when Babylon fell. It was called citrus,
   citron wood, by the Romans. It was the Callitris quadrivalvis of
   botanists, of the cone-bearing order of trees, and of the
   cypress tribe of this order. The name of this wood is derived
   from the Greek word _thuein_, "to sacrifice," and it was so
   called because it was burnt in sacrifices, on account of its
   fragrance. The wood of this tree was reckoned very valuable, and
   was used for making articles of furniture by the Greeks and
   Romans. Like the cedars of Lebanon, it is disappearing from the
   forests of Palestine.