What is the root word of whole?

The root word of "whole" is "hol". This root, found in Old English and Germanic languages, means "sound, healthy, complete".

It's interesting to note that "hol" is also the root of words like:

* "hale": meaning healthy or sound

* "holy": meaning sacred or pure

* "heal": meaning to make healthy or whole

So, "whole" literally means "completely sound or healthy".