'angiitis' originates from New Latin, specifically the word 'angiītis,' where 'angio-' meant 'vessel' and '-itis' meant 'inflammation.'

'angiītis' was formed in modern medical terminology by combining Greek roots and Latin suffixes, and eventually became the modern English word 'angiitis.'

Initially, it meant 'inflammation of a vessel,' and this meaning has remained unchanged in modern usage.