Rust Is a Form of This Chemical Compound

This page is the CodyCross answer for the clue below from Popcorn Time, Group 390, Puzzle 2 (Art Department).

Question is: Rust Is a Form of This Chemical Compound

and the answer is: IRONOXIDE

Word Meaning:

IRON OXIDE — (chemistry) Either of two compounds obtained by the reaction of oxygen on iron. Generally known as rust when hydrated.

Definitions from Wiktionary.

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