a radioactive chemical element with a very short half-life: a transactinide produced by bombarding bismuth with high-energy nuclear particles: symbol, Bh; at. no., 107
See bohrium in American Heritage Dictionary 4
(bôrˈē-əm, bōrˈ-)
noun Symbol Bh
An artificially produced radioactive element with atomic number 107 whose most long-lived isotopes have mass numbers of 261, 262, and 264 with half-lives of 11.8 milliseconds, 0.1 second, and 0.44 second, respectively. Also called unnilseptium. See Table at element.