slime(-pit)

Boyd’s Bible Dictionary:

The slime of Babel, and that of the pits of Siddim, and the ark of Moses, was mineral pitch or bitumen
({vi 270;347}Gen. 11:3; 14:10; Ex. 2:3).

Concise Bible Dictionary:

The word is chemar, and signifies “bitumen.” It is found on the shores of the Salt Sea and elsewhere in SLIME-PITS. When mixed with tar it forms a hard cement impervious to water (Gen. 11:3; Gen. 14:10; Ex. 2:3).
Area of bituminous wells S. of Mosul. Series of bitumen storage pools.

Strong’s Dictionary of Hebrew Words:

Transliteration:
chemar
Phonic:
khay-mawr’
Meaning:
from 2560; bitumen (as rising to the surface)
KJV Usage:
slime(-pit)