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prom
prom.
promenade
promenade concert
promenade deck
promethazine
Promethean
Prometheus
promethium
prominence
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promethium
pro·me·thi·um [ prə mthee əm ]


noun 
Definition:
 
radioactive metallic element: a radioactive metallic element. Source: fission of uranium, thorium, or plutonium. Use: phosphorescent paints, X-ray source.
Symbol  Pm
[Mid-20th century. After Prometheus]
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