filius

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Latin word filius comes from Proto-Indo-European *dʰeh₁(y)-, Latin felicem, and later Proto-Italic *feiljos (Son.)

*dʰeh₁(y)- (Proto-Indo-European)

to suck, to suck, suckle

felicem (Latin)

*dʰeh₁y-li-os (Proto-Indo-European)

sucker

*dʰeh₁ylios (Proto-Indo-European)

*feiljos (Proto-Italic)

Son.

fīlios (Old Latin)

filius (Latin)

(by extension) any male descendant. (in the plural) children. A son.

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