maltha

from WordNet (r) 3.0 (2006)

maltha
    n 1: a thick black tar intermediate between petroleum and
         asphalt [syn: {maltha}, {mineral tar}]

from The Collaborative International Dictionary of English v.0.48

Maltha \Mal"tha\ (m[a^]l"th[.a]), n. [L., fr. Gr. ma`lqa.]
   1. A variety of bitumen, viscid and tenacious, like pitch,
      unctuous to the touch, and exhaling a bituminous odor.
      [1913 Webster]

   2. Mortar. [Obs.] --Holland.
      [1913 Webster]