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According to Wikipedia that is because the bird-hipped ones looked like modern birds and the names came before we realized the error.
Hooray!
The real facts are the ones we met along the comments.
The comments in a healthy social network are the only way to get near the truth at this point. I read the comments before the article at this point
Dinosaur translates to "terrible lizard" so retaining outdated terminology is on brand.
To be fair, some of them were pretty damn terrible!
They're so terrible at being lizard that they turn out to be birds...
Was it before we know birds were related to dinosaurs at all? And while we're at it: when did we find that out?
Quickly skimming Wikipedia Orthopoda (now synonymous to Ornithischia, bird hips) was coined in 1866. Birds from dinosaurs as an idea kinda gain traction during 1868. It was during 1870s when the famous full Archaeopteryx fossil was found is when it really get cemented. Missed it just by a few years.