[mal-thuh] 
| 1. | a liquid bitumen used in ancient times as a mortar or waterproofing agent. |
| 2. | any of various natural mixtures of bituminous hydrocarbons. |
| 3. | a viscous mineral liquid or semiliquid bitumen; a mineral tar. |
| mal·tha (māl'thə) n. A black, viscous natural bitumen. [Middle English malthe, from Latin maltha, from Greek, a mixture of wax and pitch; see mel-1 in Indo-European roots.] |