follow Dictionary.com

11 Trending Words of 2014

thallus

[thal-uh s] /ˈθæl əs/
noun, plural thalli
[thal-ahy] /ˈθæl aɪ/ (Show IPA),
thalluses. Botany, Mycology
1.
a simple vegetative body undifferentiated into true leaves, stem, and root, ranging from an aggregation of filaments to a complex plantlike form.
Origin
1820-1830
1820-30; < New Latin < Greek thallós young shoot, twig
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for thallus
  • 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.
British Dictionary definitions for thallus

thallus

/ˈθæləs/
noun (pl) thalli (ˈθælaɪ), thalluses
1.
the undifferentiated vegetative body of algae, fungi, and lichens
Derived Forms
thalloid, adjective
Word Origin
C19: from Latin, from Greek thallos green shoot, from thallein to bloom
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for thallus
n.

Latin, from Greek thallos "green shoot, twig," related to thalia "abundance," thalos "scion, child," ultimately from PIE root *dhal- "to bloom" (cf. Old Irish duilesc, a type of algae).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
thallus in Medicine

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.
Cite This Source
thallus in Science
thallus
  (thāl'əs)   
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.
Cite This Source

Word of the Day

Difficulty index for thallus

Most English speakers likely know this word

Word Value for thallus

10
12
Scrabble Words With Friends

Nearby words for thallus