Etymology

hypophosphorous

H4Y4P3O1P3H4O1S1P3H4O1R1O1U1S1

Today it means: Of or pertaining to hypophosphorous acid or its derivatives Full definition →

English phosphorous ← Ancient Greek ὑπο- (hupo-) ← Proto-Indo-European *upó
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The story

  1. Proto-Indo-European*upó
  2. Ancient Greekῠ̔πό (hŭpó)
  3. Ancient Greekὑπο- (hupo-)
  4. Englishhypo-
  5. Englishphosphorous
  6. English todayhypophosphorous

From hypo- + phosphorous.

Etymology from Wiktionary, CC BY-SA 4.0.