A plural or variant form referring to multiple inner arterial tissues or structures, a rare anatomical term.
From endarterium (inner artery layer) + -ia (plural suffix in medical Latin). This appears to be a less commonly used variant for describing multiple instances of inner arterial tissue.
Medical terminology sometimes creates words that look logical but never quite catch on because doctors prefer more direct names—this word probably lost out to simpler terms like 'intimal layers' or just 'inner arteries.'
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