Definitions for vitamin b12
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Princeton's WordNet
vitamin B12, cobalamin, cyanocobalamin, antipernicious anemia factor(noun)
a B vitamin that is used to treat pernicious anemia
Wiktionary
vitamin B12(Noun)
The compound cobalamin or cyanocobalamin.
Citation
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"vitamin b12." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/vitamin b12>.

