#initial-load-header-loader { visibility: hidden!important; } #initial-load-content { visibility: visible!important; } .expandable .expandable-control { display: none!important; } .expandable .expandable-content { display: block!important; visibility: visible!important; max-height: none!important; height: auto!important; }

uranium 239

noun Chemistry.

the uranium isotope with a mass number 239. It is artificially produced by the neutron bombardment of uranium 238.

Also called U-239, U 239.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019