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Latin word altus comes from Proto-Indo-European *h₂el-, and later Proto-Indo-European *h₂életi (To be nourishing.)
*h₂el- (Proto-Indo-European)
*h₂életi (Proto-Indo-European)
To be nourishing.
*alō (Proto-Italic)
alo (Latin)
I feed, I maintain, I develop. I foster, nourish.
altus (Latin)
Deep. Deep-rooted. High, tall. Profound.