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Latin word altum comes from Proto-Indo-European *h₂el-, and later Proto-Indo-European *h₂életi (To be nourishing.)
*h₂el- (Proto-Indo-European)
to raise, feed, nourish, beyond, to grow
*h₂életi (Proto-Indo-European)
To be nourishing.
*alō (Proto-Italic)
altum (Latin)
The deep, the sea.