palaeornithology
/ˌpalɪɔːnɪˈθɒlədʒi/ /ˌpeɪlɪɔːnɪˈθɒlədʒi/Palaeontology
noun
The branch of palaeontology or ornithology that deals with extinct and fossil birds.
Origin
Early 20th century; earliest use found in The New English Dictionary. From palaeo- + ornithology.