hypophosphoric acid

noun
hy·​po·​phos·​phor·​ic acid | \ -fäs-ˌfȯr-ik- How to pronounce hypophosphoric acid (audio) , -ˌfär- How to pronounce hypophosphoric acid (audio) , -ˌfäs-f(ə-)rik-\

Medical Definition of hypophosphoric acid

: an unstable acid H4P2O6 with four replaceable hydrogen atoms that is usually obtained in the form of its salts