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Answer for the clue "Duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet ", 11 letters:
corythosaur

Word definitions for corythosaur in dictionaries

WordNet Word definitions in WordNet
n. duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet [syn: corythosaurus ]

Usage examples of corythosaur.

It was when the Corythosaur chased him, bleating and bellowing like a monster cow, when he disturbed its feeding.