| thalassography | The study or science of the life of marine organisms. Origin: Gr. Sea. Source: Websters Dictionary (01 Mar 1998) |
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| thalassophobia | <psychology> Morbid fear of the sea. Origin: G. Thalassa, the sea, + phobos, fear (05 Mar 2000) |
| thalassoposia | Synonym: mariposia. Origin: G. Thalassa, the sea, + posis, drinking (05 Mar 2000) |
| thalassotherapy | The therapeutic use of seaside resorts; includes treatment by sea air, sea voyages, and sea bathing. (12 Dec 1998) |
| thalia | That one of the nine Muses who presided over comedy. One of the three Graces. One of the Nereids. Origin: L, fr. Gr, originally, blooming, luxuriant, akin to to be luxuriant. Source: Websters Dictionary (01 Mar 1998) |
| thaliacea | <zoology> A division of Tunicata comprising the free-swimming species, such as Salpa and Doliolum. Origin: NL. See Thalia. Source: Websters Dictionary (01 Mar 1998) |
| thalidomide | <drug> Sedative drug that when taken between 3rd and 5th week of pregnancy produced a range of malformations of the foetus, in severe cases complete absence of limbs (amelia) or much reduced limb development (phocomelia). A teratogen. (18 Nov 1997) |
| thallate | <chemistry> A salt of a hypothetical thallic acid. Source: Websters Dictionary (01 Mar 1998) |
| thallene | <chemistry> A hydrocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence. Source: Websters Dictionary (01 Mar 1998) |
| thallic | <chemistry> Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a higher valence as contrasted with the thallous compounds; as, thallic oxide. Source: Websters Dictionary (01 Mar 1998) |
| thalline | <botany> Consisting of a thallus. <chemistry> An artificial alkaloid of the quinoline series, obtained as a white crystalline substance, C10H13NO, whose salts are valuable as antipyretics; so called from the green colour produced in its solution by certain oxidizing agents. Origin: Gr. A young shoot or branch. Source: Websters Dictionary (01 Mar 1998) |
| thallious | <chemistry> See Thallous. Source: Websters Dictionary (01 Mar 1998) |
| thallium | <chemistry> A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7. Origin: NL, fr. Gr. Young or green shoot or branch, twig. So called from a characteristic bright green line in its spectrum. Source: Websters Dictionary (01 Mar 1998) |
| thallium 201 | <radiology> Tl-201, half-life: 73 hours (ca. 3 days), radiation: 68-80 keV photons (mercury X-rays), 135 and 167 keV gamma rays, cyclotron produced see: myocardial perfusion imaging (12 Dec 1998) |
| thallium heart scan | <cardiology, investigation, radiology> A test which 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) |