The Deipnosophists (2.14)

He was acquainted too with the effect which warm water has on wounds: at all events he describes Eurypylus's wounds as being washed with it; and yet, if the object was to stop the hemorrhage, cold water would have been useful, since that contracts and closes up wounds; but with the view of relieving the pain, he bathes these with warm water, which has a soothing effect. And in Homer the word λιαρὸς is used for what we call θερμὸς, warm. And he shows that plainly enough in what he says about the fountains of the Scamander, saying—

Next by Scamander's double source they bound,

Where two famed fountains burst the parted ground;

This warm, through scorching clefts is seen to rise,

With exhalations steaming to the skies.[*]

Can we call that only warm from which a steam of fire, and a fiery smoke arises? But of the other source he says—

That, the green banks in summer's heat o'erflows,

Like crystal clear, and cold as winter's snows.

And he often speaks of men newly wounded being bathed in warm water. In the case of Agamemnon he says—

With his warm blood still welling from the wound.[*]

And in the case of a stag fleeing after it had been wounded, he says, in a sort of paraphrase—

While his warm blood and mighty limbs were strong.[*]

The Athenians call χλιαρὸν, which is properly lukewarm, μετάκερας, as Eratosthenes uses the word, saying,

Watery by nature, and lukewarm, μετάκερας.