Source : WordNet®

lignum vitae
     n 1: hard greenish-brown wood of the lignum vitae tree and other
          trees of the genus Guaiacum [syn: {guaiac}, {guaiacum}]
     2: small evergreen tree of Caribbean and southern Central
        America to northern South America; a source of lignum
        vitae wood, hardest of commercial timbers, and a medicinal
        resin [syn: {Guaiacum officinale}]