מְרֹרָה mᵉrôrâh (H4846)

properly, bitterness; concretely, a bitter thing; specifically bile; also venom (of a serpent)

1) bitter thing, gall, poison 1a) gall, gall-bladder (seat of gall) 1b) poison, venom 1c) bitter thing 1d) bitterness

or מְרוֹרָה; from מָרַר (H4843);