thal·lus

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

Origin:
1820–30; < Neo-Latin < Greek thallós young shoot, twig

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World English Dictionary
thallus (ˈθæləs) [Click for IPA pronunciation guide]
 
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]
 
'thalloid
 
adj

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00:10
Thallus is always a great word to know.
So is quincunx. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Profiles: branched filaments arising from an attached thallus.
We found that the long ogo initially has a higher growth rate, but this drops with time as thallus nitrogen stores are depleted.
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