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Artery entered English in the late Middle English period through Latin from Greek artēria, probably related to aeirein, “to raise.” Ancient writers associated the word with Greek aēr, “air,” because arteries found after death contain no blood and were therefore thought to be air ducts; medieval writers instead believed that they carried an ethereal substance called spiritual blood or vital spirits.
Etymology
Late Middle English arterie, borrowing from Old French artaire and Latin artēria (“a windpipe; an artery”), from Ancient Greek ᾰ̓ρτηρῐ́ᾱ (ărtērĭ́ā, “windpipe; artery”).
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