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]WordNet (r) 3.0 (2006):
maltha n 1: a thick black tar intermediate between petroleum and asphalt [syn: maltha, mineral tar]