VAS- Meaning of VAS- in English [vas-] or vaso- comb form [NL, fr. L vas] 1: vessel: as a: blood vessel "vasomotor" b: vas deferens "vasectomy" 2: vascular and "vasovagal" 3: vasomotor "vasoactive" Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012