Maltha

noun

1. A black, viscous natural bitumen.
2. A bituminous substance midway in consistency between asphaltum and petroleum.
3. Haeckel's term for the gelatinous ground-substance or mesoglcea and contained cells of various kinds, which forms the skeletogenous layer in sponges.
4. A variety of bitumen, viscid and tenacious, like pitch, unctuous to the touch, and exhaling a bituminous odor.
5. Mortar.