The Collaborative International Dictionary of English v.0.48:
Ornithologic \Or`ni*tho*log"ic\, Ornithological \Or`ni*tho*log"ic*al\, a. [Cf. F. ornithologique.] Of or pertaining to ornithology; as, her ornithological interests. [1913 Webster]WordNet (r) 3.0 (2006):
ornithological adj 1: of or relating to ornithology; "her ornithological interests"