The Collaborative International Dictionary of English v.0.48:
Ruddiness \Rud"di*ness\, n. The quality or state of being ruddy; as, the ruddiness of the cheeks or the sky. [1913 Webster]WordNet (r) 3.0 (2006):
ruddiness n 1: a healthy reddish complexion [syn: ruddiness, rosiness]