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Latin word flos comes from Proto-Indo-European *bʰlē-dʰ-, and later Proto-Italic *flōs (Flower, blossom.)
*bʰlē-dʰ- (Proto-Indo-European)
*bʰleh₃-s (Proto-Indo-European)
*flōs (Proto-Italic)
Flower, blossom.
flos (Latin)
(figuratively) an ornament or embellishment. (figuratively) the best kind or part of something. (figuratively) the prime; best state of things. Flower, blossom.