Juno was the Roman goddess of marriage and childbirth. Juno was also the wife and sister of the Roman god Jupiter. Lily Dale uses this word while describing Crosbie’s fiancé Lady Alexandrina de Courcy to convey how she believes her to be tall and handsome in appearance. Lily’s use of this term perhaps invokes a sense of power and authority that Lady Alexandrina has over Lily much in the way Juno had precedence over Jupiter’s other consorts. [AM 2006]
Sources: Cassell’s Dictionary of Classical Mythology.