Etymology
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Words related to ornitho-

erne (n.)
"sea eagle," from Old English earn "eagle," from Proto-Germanic *aron-, *arnuz "eagle" (source also of Old High German arn, German Aar, Middle Dutch arent, Old Norse örn, Gothic ara "eagle"), from PIE root *or- "great bird" (source also of Greek ornis "bird," Old Church Slavonic orilu, Lithuanian erelis, Welsh eryr "eagle"). The Germanic word also survives in the first element of names such as Arnold and Arthur.
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Avernus 
volcanic lake in Campania, looked upon by the ancients as an entrance to Hell, usually derived from a Latinization of Greek aornos "without birds," from a- "not, without" (see a- (3)) + ornis "a bird" (see ornitho-), supposedly from the vapors which killed birds attempting to fly over it. Related: Avernal.
ornithology (n.)

"scientific study or knowledge of birds," 1670s, from Modern Latin ornithologia (1590s); see ornitho- + -logy.

ornithomancy (n.)

"divination by means of birds," 1650s; see ornitho- + -mancy. Middle English had it as ornomanci (late 15c.). Related: Ornithomantic.

ornithopod (n.)

1933, short for ornithopod dinosaur (1888), from Modern Latin Ornithopoda (1881), the suborder of dinosaurs whose hind legs are like those of birds, from ornitho- "bird" + Greek podos, genitive of pous "foot" (from PIE root *ped- "foot").

ornithopter (n.)

1908, from French ornithoptère (1908), a machine designed to fly by mechanical flapping of wings, from ornitho- + Greek pteron "wing" (from PIE root *pet- "to rush, to fly"). A mode of flight considered promising at least since Leonardo's day.