hypovolaemiaPronunciation: /ˌhʌɪpə(ʊ)vəˈliːmɪə/ (US hypovolemia)Definition of hypovolaemia noun [mass noun] Medicine a decreased volume of circulating blood in the body. Derivatives hypovolaemic adjective Origin: 1920s: from hypo- 'under' + volume + Greek haima 'blood'hypovolaemia in other Oxford dictionaries Definition of hypovolaemia in the US English dictionary