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hy·po·phos·phor·ic acid | \ -fäs-ˌfȯr-ik- 
, -ˌfär- , -ˌfäs-f(ə-)rik- \
, -ˌfär- , -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
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