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thallus (n.)

1829, Latin, from Greek thallos "green shoot, young branch, twig," related to thalia "abundance," thalos "scion, child," ultimately from PIE root *dhal- "to bloom" (source also of Armenian dalar "green, fresh," Albanian dal' "I sprout," Old Irish duilesc, a type of algae).

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Definitions of thallus

thallus (n.)
a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes;
From wordnet.princeton.edu