Heal

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

wiktionary

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From Middle English helen, from Old English hǣlan(“to heal, cure, save, greet, salute”), from Proto-West Germanic *hailijan, from Proto-Germanic *hailijaną(“to heal, make whole, save”), from Proto-Indo-European *koyl-(“safe, unharmed”).

See hele.

etymonline

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heal (v.)

Old English hælan "cure; save; make whole, sound and well," from Proto-Germanic *hailjan (source also of Old Saxon helian, Old Norse heila, Old Frisian hela, Dutch helen, German heilen, Gothic ga-hailjan "to heal, cure"), literally "to make whole" (from PIE *kailo- "whole;" see health). Intransitive sense from late 14c. Related: Healed; healing.