Healing

google

ref

Old English hǣlan (in the sense ‘restore to sound health’), of Germanic origin; related to Dutch heelen and German heilen, also to whole.

wiktionary

ref

From Middle English heelinge, helynge, from Old English hǣling(“healing”), from Proto-Germanic *hailingō(“healing”), from Proto-Germanic *hailijaną(“to heal”), equivalent to heal +‎ -ing. Cognate with West Frisian hieling(“healing”), Dutch heling(“healing”), German Heilung(“healing; cure”).

From Middle English heelyng, equivalent to heal +‎ -ing.

etymonline

ref

healing (n.)

"restoration to health," Old English hæling, verbal noun from heal (v.). Figurative sense of "restoration of wholeness" is from early 13c.; meaning "touch that cures" is from 1670s.