From chamar; bitumen (as rising to the surface) -- slime(-pit).
see HEBREW chamar
H2564. chemar
חֵמָר noun [masculine] bitumen, asphalt (from I. חמר according to OBlauZMG 1869, 279, bitumen as seething, swelling up; Thes MV, from IV. חמר, with reference to reddish-brown colour) — חֵמָר Genesis 11:3 2t.; used for cement in building Babel 11:3 (J); abounding in vale of Siddim ח בֶּאֱרֹת ׳בֶּאֱרֹת 14:10; used in coating Moses' 'ark' of bulrushes Exodus 2:3 (E; "" זָ֑פֶת).