Definition of "red-haired"

It is observed, that the red haired of both sexes are more libidinous and mischievous than the rest, whom yet they much exceed in strength and activity.

1726, Jonathan Swift, chapter VIII, in Gulliver's Travels‎, Part IV

Talk to that noble sage at Pylos, Nestor, / then go to Meneláos, the red-haired king / at Sparta, last man home of all the Akhaians.

1961, Homer, translated by Robert Fitzgerald, The Odyssey, Book One, Prentice Hall, published 2001, lines 320–22