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prolegomenon
prolepsis
proletarian
proletariat
proliferate
proliferous
prolific
proline
prolix
prolocutor
Prolog
prologue
prologuize
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prolonge
PROM
prom
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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]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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