The Collaborative International Dictionary of English v.0.48:
Hairiness \Hair"i*ness\ (-[i^]*n[e^]s), n. 1. The state of abounding, or being covered, with hair. --Johnson. [1913 Webster] 2. The quality of being hairy. [PJC]WordNet (r) 3.0 (2006):
hairiness n 1: the quality of having hair [syn: hairiness, pilosity] [ant: hairlessness]