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Old English word hǣlan comes from Proto-Indo-European *ki-(eu-), Proto-Indo-European *kóh₂ilus, Proto-Indo-European *kóylos, Proto-Indo-European *koyl-, Proto-Indo-European *kóh₂ilos, and later Proto-Germanic *hailaz (Entire, complete. Healthy, sound. Whole, unbroken, intact.)
*ki-(eu-) (Proto-Indo-European)
*kóh₂ilus (Proto-Indo-European)
*kóylos (Proto-Indo-European)
*koyl- (Proto-Indo-European)
*kóh₂ilos (Proto-Indo-European)
*koil- (Proto-Indo-European)
*hailaz (Proto-Germanic)
Entire, complete. Healthy, sound. Whole, unbroken, intact.
*hailijaną (Proto-Germanic)
To heal, to make healthy. To make whole, to mend.
hǣlan (Old English)