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radium-B

radium B

noun Chemistry.
an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Radium-b is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
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