thallus

The story

1. Proto-Indo-European · derived from*dʰelh₁-“to bloom”
2. Ancient Greek · borrowed fromθαλλός“young shoot, twig”
3. English todaythallus

From Ancient Greek θαλλός (thallós, “young shoot, twig”), from Proto-Indo-European *dʰelh₁- (“to bloom”).

Words from the same roots