red precipitate

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red precipitate (uncountable)

  1. (chemistry, obsolete) Mercuric oxide (HgO), a heavy red crystalline powder obtained by heating mercuric nitrate, or by heating mercury in the air.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.