Associations to the word «Protoactinium»
Noun
Adjective
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Wiktionary
PROTOACTINIUM, noun. Alternative form of protactinium (dated)
Dictionary definition
PROTOACTINIUM, noun. A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.
Wise words
It is only with the heart that one can see rightly; what is
essential is invisible to the eye.