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The following 3 entries include the term 2,3-.
2,3-diphosphoglycerate
noun: an isomeric ester of diphosphoglyceric acid that occurs in human red blood cells and facilitates release of oxygen by decreasing the oxygen affinity of hemoglobin
2,3,7,8-tetrachlorodibenzo-para-dioxin
noun2,3,7,8-tetrachlorodibenzo-p-dioxin
noun-
- Before we went to her house, Hannah told us her aunt was a flibbertigibbet.


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Merriam-Webster unabridged