Crossword Genius

Zinc __ ointment (5)

Ross

I believe the answer is:

oxide

(Other definitions for oxide that I've seen before include "Oxygenous compound" , "Compound of two elements, one with atomic number 8" , "Rust, for instance" , "Compound such as rust" , "Rust is iron -" .)

I've seen this clue in the Newsday.
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