hippocratic : Idioms & Phrases

• L. facies Hippocratica, the change produced in the countenance by death, or long sickness, excessive evacuations, excessive hunger, and the like. The nose is pinched, the eyes are sunk, the temples hollow, the ears cold and retracted, the skin of the forehead tense and dry, the complexion livid, the lips pendent, relaxed, and cold; so called, as having been described by Hippocrates. Dunglison.

Webster 1913

• noun an oath taken by physicians to observe medical ethics deriving from Hippocrates
  

WordNet

• an oath said to have been dictated by Hippocrates to his disciples. Such an oath is still administered to candidates for graduation in medicine.

Webster 1913