deep and painful regret for wrongdoing; compunction.
2.
Obsolete. pity; compassion.
Origin: 1325–75; ME < MF remors < ML remorsus, equiv. to L remord(ere) to bite again, vex, nag (re-re-+ mordere to bite) + -tus suffix of v. action, with dt > s;see mordant
Moral anguish arising from repentance for past misdeeds; bitter regret. See Synonyms at penitence.
Obsolete Compassion.
[Middle English remors, from Old French, from Medieval Latin remorsum, from neuter past participle of Latin remordēre, to torment : re-, re- + mordēre, to bite; see mer- in Indo-European roots.]
c.1374, from O.Fr. remors (Fr. remords), from M.L. remorsum, from neut. pp. of L. remordere "to vex, disturb," lit. "to bite back," from re- "again" + mordere "to bite" (see smart (v.)). The sense evolution was via the M.L. phrase remorsus conscientiæ (translated into M.E. as ayenbite of inwit).