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diatomaceous earth
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diastereoisomer

di·a·ste·re·o·is·o·mer [ d ə steree ō ssəmər ] (plural di·a·ste·re·o·is·o·mers) or di·a·ste·re·o·mer [ d ə stérree ōmər ] (plural di·a·ste·re·o·mers)


noun 
Definition:
 
near-identical molecule: a molecule that has the same formula and structure as another stereoisomer, but is arranged differently in space and is therefore not a mirror image

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