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

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now