from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A silvery-gray radioactive metal, the first synthetically produced element, having 14 isotopes with masses ranging from 92 to 105 and half-lives up to 4.2 × 106 years. It is used as a tracer and to eliminate corrosion in steel. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metallic chemical element (symbol Tc) with an atomic number of 43.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a crystalline metallic element not found in nature; occurs as one of the fission products of uranium
From Greek tekhnētos, artificial, from tekhnāsthai, to make by art, from tekhnē, art; see technical.(American Heritage® Dictionary of the English Language, Fourth Edition)
techno- + -ium because it was the first artificially created element. (Wiktionary)