Resembling or having properties similar to halogens.
From 'halogen' + '-oid' (suffix meaning 'resembling'). A descriptive term from 19th-century chemistry for elements or compounds with halogen-like characteristics.
Elements like oxygen and sulfur can act 'halogenoid'—they behave somewhat like halogens chemically even though they're different, which taught chemists that periodic table organization reveals functional family groups beyond just element type.
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