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Meaning of hypophosphorous

hy•po•phos•phor•ous

Pronunciation: (hī"pu-fos'fur-us, -fos-fôr'us, -fōr'-), [key]
— adj.
  1. of or derived from hypophosphorous acid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.