The Collaborative International Dictionary of English v.0.48:

Calambour \Cal"am*bour\ (k[a^]l"[a^]m*b[=oo]r), n. [See
   Calambac.]
   A species of agalloch, or aloes wood, of a dusky or mottled
   color, of a light, friable texture, and less fragrant than
   calambac; -- used by cabinetmakers.
   [1913 Webster]