The Collaborative International Dictionary of English v.0.48:
Brownness \Brown"ness\, n. The quality or state of being brown. [1913 Webster] Now like I brown (O lovely brown thy hair); Only in brownness beauty dwelleth there. --Drayton. [1913 Webster]WordNet (r) 3.0 (2006):
brownness n 1: an orange of low brightness and saturation [syn: brown, brownness]