Term: plutonium 239: a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons
Candidate hypernym: plutonium: a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239 → 1
Candidate hypernym: laconian: a resident of Laconia → 0
Candidate hypernym: japanese iris: iris native to Japan having large showy flowers → 0
Candidate hypernym: west: the cardinal compass point that is a 270 degrees → 0
Candidate hypernym: bellwether: sheep that leads the herd often wearing a bell → 0
Candidate hypernym: cytokinesis: organic process consisting of the division of the cytoplasm of a cell following karyokinesis bringing about the separation into two daughter cells → 0
Candidate hypernym: baffled: people who are frustrated and perplexed → 0
Candidate hypernym: imprisonment: the act of confining someone in a prison (or as if in a prison) → 0
Candidate hypernym: boletus chrysenteron: a fungus convex cap and a dingy yellow under surface and a dry stalk → 0
Candidate hypernym: ways and means committee: a permanent committee of the United States House of Representatives that makes recommendations to the US House on all bills that would raise revenue → 0
Candidate hypernym: silurid: Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin → 0