Wiktionary
n. (root word English)
Usage examples of "root words".
But Eleazar ben Enokh, a Yeshuite who dwelt in the City of Elua, kept his heart attuned to his One God and courted Him with profound meditation, fasting and reciting hymns, composed in Habiru and Akkadian alike, seeking betwixt the two to find the original root words, the First Word of Creation that spoke the world into beingfor that, he believed, was the Name of God.
The other diseases he didn't know except from the root words, which were very very old.
The early Sumerian/Babylonian word K(a)N(a)B(a), or Q(a)N(a)B(a) is one of man's longest surviving root words.
He may not have taken Spanish in school, but Latin had at least given him a familiarity with some of the root words, and what they were speaking was certainly not Spanish or any other Romance language.