Meaning of thallus

thal•lus

Pronunciation: (thal'us), [key]
— pl. thal•li thal•lus•es.
  1. a simple vegetative body undifferentiated into true leaves, stem, and root, ranging from an aggregation of filaments to a complex plantlike form.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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