mercury iodide

noun

: 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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