We found one dictionary that defines the word orthophosphorous acids:

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1. orthophosphorous acids: Collins English Dictionary

(Note: See orthophosphorous_acid as well.)

Definitions from WordNet (orthophosphorous acid) ▸ noun:  a clear or yellow-colored monobasic acid (H3PO2) ▸ Also see orthophosphorous_acid ▸ Words similar to orthophosphorous acids ▸ Usage examples for orthophosphorous acids ▸ Idioms related to orthophosphorous acids ▸ Wikipedia articles (New!) ▸ Words that often appear near orthophosphorous acids ▸ Rhymes of orthophosphorous acids ▸ Invented words related to orthophosphorous acids