Definition of mercury iodide
: either of two iodides of mercury: a : a yellow amorphous powder Hg2I2 that turns greenish on exposure to light —called also mercurous iodide b : a red crystalline poisonous salt HgI2 that changes to a yellow crystalline modification when heated above 126° C and that is used chiefly in medicine —called also mercuric iodide
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