maltha

A black, viscous natural bitumen.

A bituminous substance midway in consistency between asphaltum and petroleum.

Haeckel’s term for the gelatinous ground-substance or mesoglcea and contained cells of various kinds, which forms the skeletogenous layer in sponges.

A variety of bitumen, viscid and tenacious, like pitch, unctuous to the touch, and exhaling a bituminous odor.

Mortar.

thick mineral pitch

mineral tar

a thick black tar intermediate between petroleum and asphalt