'angiosis' originates from Greek, specifically the word 'angeion' meaning 'vessel' and the suffix '-osis' meaning 'condition' or 'disease'.

'angeion' and '-osis' combined in medical Latin to form 'angiosis', which was then adopted into modern medical English.

Initially, it meant 'a condition of the vessels', and over time it has come to specifically refer to pathological or diseased conditions of blood vessels.