Go to 'thermo-' entry Go to 'dino-' entry Go to 'chondro-' entry Go to 'aero-' entry Go to '-logy' entry Go to 'thaumato-' entry Go to 'nano-' entry Go to '-sophy' entry Go to 'bucco-' entry Go to '-ism' entry Go to '-lysis' entry Go to 'galacto-' entry Go to '-anthropy' entry Go to 'pneumo-' entry Go to '-ploitation' entry Go to '-lithic' entry Go to '-sepalous' entry Go to 'onco-' entry Go to '-parous' entry Go to 'dermato-' entry Go to 'multi-' entry Go to 'dodeca-' entry Go to '-zoon' entry Go to 'vermi-' entry Go to 'crystallo-' entry Go to 'biblio-' entry Go to 'eco-' entry Go to 'juxta-' entry Go to 'facio-' entry
Affixes: the building blocks of English
Affixes: the building blocks of English

thall(o)-

A thallus; thallium.

[Greek thallos, green shoot.]

A thallus is a plant body that is not differentiated into stem and leaves, typical of algae, fungi, lichens, and some liverworts. A thallophyte (Greek phuton, a plant) is a plant that consists of a thallus; linked adjectives are thalloid and thalline. The element thallium was given its name by its discoverer Sir William Crookes (1832–1919) because of a bright green line in its spectrum; the adjective thallous refers to that metal in its monovalent state (as in thallous oxide, Tl2O), while thallic refers to trivalent thallium (as in thallic chloride, TlCl3).

Visit Michael Quinion’s World Wide Words site for 2000+ articles on English!

Copyright © Michael Quinion 2008–. All rights reserved. Page last updated 23 September 2008.
Your comments and suggestions on the site are very welcome.