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The Collaborative International Dictionary
Ornithichnology

Ornithichnology \Or`nith*ich*nol"o*gy\, n. [Ornitho- + ichnology.] (Paleon.) The branch of science which treats of ornithichnites.
--Hitchcock.

Wiktionary
ornithichnology

n. (context paleontology English) The branch of science that deals with ornithichnites.