Containing or producing halogens; relating to or characterized by halogens.
From 'halogen' + '-ous' (adjective suffix meaning 'containing' or 'full of'). A formal chemical descriptor from 19th-century systematic nomenclature.
The '-ous' suffix is chemistry's way of saying 'containing'—just like 'aqueous' means 'containing water,' 'halogenous' means 'containing halogens,' and this systematic naming lets scientists instantly understand compound composition from the word alone.
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