Dictionary  thal•lusPronunciation: (thal'us), [key] —n., —pl. thal•liPronunciation: (thal'ī), [key] thal•lus•es. Bot., Mycol. 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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