| thallospore | An obsolete term for a reproductive asexual type of spore formed as an integral part of the thallus or mycelium, in contrast to a conidium formed on a specialised hypha. Origin: G. Thallos, a green twig, + sporos, seed (05 Mar 2000) |
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| thallotoxicosis | Poisoning by thallium; marked by stomatitis, gastroenteritis, peripheral and retrobulbar neuritis, endocrine disorders, and alopecia. Origin: thallium + G. Toxikon, poison, + -osis, condition (05 Mar 2000) |
| thallous | <chemistry> Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a lower valence as contrasted with the thallic compounds. Alternative forms: thallious. Source: Websters Dictionary (01 Mar 1998) |
| thallus | The vegetative body of a plant that is not differentiated into organs such as stems and leaves, for example algae, the gametophytes of many liverworts. (09 Oct 1997) |