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plural lambeosaurs
(paleontology) A crested duck-billed dinosaur of the family Hadrosauridae. quotations
Bipedal hadrosaurs, great hulking lambeosaurs, certain rhino-like ceratopsians and relatives of the velociraptors - all large and probably able swimmers - had the greatest success.
2018, Tim Flannery, Europe: A Natural History, page 31