swan

swan O.E. swan, from P.Gmc. *swanaz (Cf. O.S. swan, O.N. svanr, M.Du. swane, Du. zwaan, O.H.G. swan, Ger. Schwan), probably lit. "the singing bird," from PIE root *swon-/*swen- "to sing, make sound" (see SOUND (Cf. sound) (n.¹)); thus related to O.E. geswin "melody, song" and swinsian "to make melody." In classical mythology, sacred to Apollo and to Venus. The singing of swans before death was alluded to by Chaucer (late 14c.), but swan-song (1831) is a translation of Ger. Schwanengesang. Swan dive is recorded from 1898. A black swan was proverbial for "something extremely rare or non-existent" (late 14c.), after Juvenal ["Sat." vi. 164], but later they turned up in Australia.

"Do you say no worthy wife is to be found among all these crowds?" Well, let her be handsome, charming, rich and fertile; let her have ancient ancestors ranged about her halls; let her be more chaste than all the dishevelled Sabine maidens who stopped the war--a prodigy as rare upon the earth as a black swan! yet who could endure a wife that possessed all perfections? I would rather have a Venusian wench for my wife than you, O Cornelia, mother of the Gracchi, if, with all your virtues, you bring me a haughty brow, and reckon up Triumphs as part of your marriage portion. [Juvenal]