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dithionic

[dahy-thahy-on-ik, dith-ee-]
adjective Chemistry.
  1. of or derived from dithionic acid.
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Origin of dithionic

First recorded in 1850–55; di-1 + thionic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018