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diopter
dioptric
dioptrics
diorama
diorite
Dioscuri
dioxane
dioxide
dioxin
dip
dip.
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dioxin

di·ox·in [ dī óksin ] (plural di·ox·ins)


noun 
Definition:
 
toxic chemical: a heterocyclic hydrocarbon that is a carcinogen and toxic environmental pollutant. Source: byproduct of combustion processes, manufacture of herbicides and bactericides, chlorine bleaching of paper.

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