Etymologically speaking, the asıl of a thing is its root. The Arabic root of the Turkish word means bitki kökü, “vegetable root,” according to Sevan Nişanyan’s Turkish etymological dictionary.
In the Iliad, why is Achilles so affronted by Agamemnon as to refuse to help the Greeks, even as their attack on Troy is becoming a defensive war, at the wall that they have erected about their own ships? If the answer is to be found through study, then Book IX of the Iliad is what to study.