A taxonomic group or classification, possibly relating to fossil organisms or creatures with eagle-like characteristics or forms.
From Greek aetos (eagle) + morphe (μορφή, form/shape). This appears to be an obsolete or specialized taxonomic term no longer in common use.
This is the kind of scientific name that shows how 19th-century paleontologists would name creatures based on their general appearance—if something looked vaguely eagle-like, they'd slap 'aeto-' in front and call it done, without necessarily understanding what it actually was.
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