noun, plural thalli [thal-ahy] , thalluses. Botany, Mycology.
a simple vegetative body undifferentiated into true leaves, stem, and root, ranging from an aggregation of filaments to a complex plantlike form.

1820–30; < Neo-Latin < Greek thallós young shoot, twig Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thallus (ˈθæləs)
n , pl thalli, thalluses
the undifferentiated vegetative body of algae, fungi, and lichens
[C19: from Latin, from Greek thallos green shoot, from thallein to bloom]

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American Heritage
Medical Dictionary

thallus thal·lus (thāl'əs)
n. pl. thal·lus·es or thal·li (thāl'ī)
A plant body or fungus undifferentiated into stem, root, or leaf.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
thallus   (thāl'əs)  Pronunciation Key 
Plural thalli (thāl'ī)
A type of body found among plants and fungi that is not differentiated into roots, stems, or leaves. Thalli are found among lichens, mosses, liverworts, and many algae, as well as the gametophyte generations of horsetails and ferns, which have rhizoids but not true roots.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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