Or′ni‐thol″o‐gy (?), n. [Ornitho- + -logy: cf. F. ornithologie.] 1. That branch of zoölogy which treats of the natural history of birds and their classification.
2. A treatise or book on this science.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.