Definition of Thesium
: a large genus of Old World root-parasitic herbs of the family Santalaceae with small linear or scalelike leaves and diclinous flowers — see bastard toadflax
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Origin and Etymology of thesium
New Latin, from Latin thesium, thesion bastard toad flax, from Greek thēseion, probably from neuter of thēseios of Theseus, from Thēseus Theseus, mythological Greek hero
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