One of the upper ten; a person of high birth, a descendant of the race of kings. (Anglo-Saxon cyne, royal; cyne-dom, a kingdom; also noble, renowned, chief.)
“His wife, by birth a Cent-cyne, went out as a day-servant.” —Gaboriau: Promise of Marriage, chap. v.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894