hy·po·ka·le·mi·a 
(hī′pō-kā-lēmē-ə)
(hī′pō-kā-lēmē-ə)n.
An abnormally low concentration of potassium ions in the blood.
[HYPO- + New Latin kalium, potassium (from Medieval Latin kali, alkali, potassium, from Arabic qily, ashes, lye, potash; see ALKALI) + -EMIA.]