(Λάβδα), a daughter of the Bacchiad Amphion, and mother of Cypselus, by Eetion. (Hdt. 5.92.) According to the Etymologicum Magnum (p. 199), her name was derived from the fact of her feet being turned outward, and thus resembling the letter Λ. [Comp. CYPSELUS.]
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890