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Latin word totus comes from Proto-Indo-European *-h₂, and later Proto-Indo-European *só (That. This.)
*-h₂ (Proto-Indo-European)
Creates collective nouns, which refer to groups or sets of things.
*só (Proto-Indo-European)
That. This.
tot (Latin)
So many.
totus (Latin)
(very, rare) so great a ——.