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word of the day
protactinium
protactinium - Dictionary definition and meaning for word
protactinium
Definition
(noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Synonyms
:
atomic number 91
,
pa
,
protoactinium
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5 Great English Vocabulary Books we Recommend!
Oxford Picture Dictionary
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504 Absolutely Essential Words 6th Edition
English Vocabulary in Use Advanced with CD-ROM: Vocabulary Reference and Practice 2nd Edition
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