Noah Webster's Dictionary (n.) Corundum in the form of grains or powder, used in the arts for grinding and polishing hard substances. Native emery is mixed with more or less magnetic iron.

Multi-Version Concordance Emery (1 Occurrence) Ezekiel 3:9 As an adamant harder than flint have I made your forehead: don't be afraid of them, neither be dismayed at their looks, though they are a rebellious house. (See NAS)