lady

lady in Old English the word (in the form hlǣfdīge) denoted a woman to whom homage or obedience is due, such as the wife of a lord or the mistress of a household, and also (specifically) the Virgin Mary (Our Lady); it comes from hlāf ‘loaf’ + a Germanic base meaning ‘knead’, related to dough.
Lady Bountiful a patronizingly generous woman, named from a character in Farquhar's The Beaux' Stratagem (1707).
Lady Chapel a chapel in a church or cathedral, typically to the east of the high altar in a cathedral, to the south in a church, dedicated to the Virgin Mary.
Lady Day 25 March (the feast of the Annunciation), a quarter day in England, Wales, and Ireland.
Lady of Shalott the name given by Tennyson to Elaine, the Maid of Astolat, who died of unrequited love for Lancelot. In Tennyson's poem she is imprisoned in her tower by a magic spell, which compels her to watch in a mirror the scenes outside which she then depicts in her weaving. The mirror cracks, and the curse falls on her, when she looks directly out of the window, and sees Lancelot; she dies as her barge carries her down the river to Camelot.
Lady of the Lake in the Arthurian romances, the sorceress who gives the sword Excalibur to Arthur.
Lady of the Lamp a popular name for Florence Nightingale (1820–1910), referring to her work as a nurse in the Crimean War; this image of her in the wards at night is first alluded to by Longfellow in The Courtship of Miles Standish (1858), ‘A Lady with a Lamp shall stand In the great history of the land, A noble type of good, Heroic womanhood.’

See also faint heart never won fair lady, ladies, Old Lady of Threadneedle Street at old, the opera isn't over till the fat lady sings.