Chemistry. an element of the manganese family, not found in nature, but obtained in the fission of uranium or by the bombardment of molybdenum. Symbol: Tc; atomic weight: 99; atomic number: 43; specific gravity: 11.5.
a silvery-grey metallic element, artificially produced by bombardment of molybdenum by deuterons: used to inhibit corrosion in steel. The radioisotope technetium-99m, with a half-life of six hours, is used in radiotherapy. Symbol: Tc; atomic no: 43; half-life of most stable isotope, 97Tc: 2.6 × 106 years; valency: 0, 2, 4, 5, 6, or 7; relative density: 11.50 (calculated); melting pt: 2204°C; boiling pt: 4265°C
technetium tech·ne·ti·um (těk-nē’shē-əm, -shəm)
A radioactive metal, the first synthetically produced element, used as a tracer and to inhibit corrosion in steel. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7.
A silvery-gray, radioactive metallic element. It was the first element to be artificially made, and it is produced naturally in extremely small amounts during the radioactive decay of uranium. Technetium is used to remove corrosion from steel. Its longest-lived isotope is Tc 98 with a half-life of 4,200,000 years. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7. See Periodic Table.
[tek-ni-tron-ik] /ˌtɛk nɪˈtrɒn ɪk/ adjective 1. pertaining to or characterized by cultural changes brought about by advances in technology, electronics, and communications: a technetronic era.
noun 1. technique. 2. a technicality. 3. technics, (used with a singular or plural verb) the study or science of an art or of arts in general, especially the mechanical or industrial arts. adjective 4. technical. noun 1. (tɛkˈniːk) another word for technique 2. (ˈtɛknɪk) another word for technics
adjective 1. belonging or pertaining to an art, science, or the like: technical skill. 2. peculiar to or characteristic of a particular art, science, profession, trade, etc.: technical details. 3. using terminology or treating subject matter in a manner peculiar to a particular field, as a writer or a book: a technical report. 4. skilled […]
- Technical area
noun 1. (soccer) the area at the side of the pitch to which managers, trainers, coaches, etc are restricted during play