| thallium poisoning | A condition characterised by vomiting, diarrhoea, leg pains, and severe sensorimotor polyneuropathy; about three weeks after poisoning, temporary extensive loss of hair typically occurs; usually occurs after accidental ingestion of a rodenticide. (05 Mar 2000) |
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| thallium radioisotopes | Unstable isotopes of thallium that decay or disintegrate emitting radiation. Tl atoms with atomic weights 198-202, 204, and 206-210 are thallium radioisotopes. (12 Dec 1998) |
| thallium stress test | <cardiology, investigation> This test is used to assess coronary blood flow before and after a period of strenuous exercise. Thallium testing involves the introduction of a radioactive tracer into the bloodstream. The radioactive tracer is then measured with a special camera and a determination of coronary artery blood flow can be made. (27 Sep 1997) |
| thallogen | <botany> One of a large class or division of the vegetable kingdom, which includes those flowerless plants, such as fungi, algae, and lichens, that consist of a thallus only, composed of cellular tissue, or of a congeries of cells, or even of separate cells, and never show a distinction into root, stem, and leaf. Origin: Gr. Young shoot or branch, frond + -gen. Source: Websters Dictionary (01 Mar 1998) |
| thalloid | <anatomy> Of or resembling a thallus. (09 Oct 1997) |
| thallophyta | <botany> A primary division of plant-like organisms including all forms consisting of one-celled and cell aggregates not clearly differentiated into root, stem, and leaf, includes algae, fungi, and lichens. (09 Oct 1997) |
| thallophyte | <botany> Same as Thallogen. Origin: Gr. Young shoot + plant. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| 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) |