The Collaborative International Dictionary of English v.0.48:

anoxaemia \an`ox*ae"mi*a\, anoxemia \an`ox*e"mi*a\
   ([a^]n`[o^]ks*[=e]"m[i^]*[.a]), n. [NL.; Gr. 'an priv. +
   oxygen + Gr. a'i^ma blood.] (Med.)
   A former term used to refer to an abnormal condition due to
   deficient oxygenation of the arterial blood, as in balloon
   sickness, mountain sickness; now the term is replaced by the
   term hypoxemia. -- An`ox*ae"mic, An`ox*e"mic
   ([a^]n`[o^]ks*[=e]"m[i^]k), a.
   [Webster 1913 Suppl. + AS]

WordNet (r) 3.0 (2006):

anoxemia
    n 1: abnormally low oxygen content in arterial blood