1. Duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet
   - corythosaur

Type of: duck-billed dinosaur, hadrosaur, hadrosaurus

Part of: genus Corythosaurus

Encyclopedia: Corythosaurus

• grass tree family
• grass vetch
• grass vetchling
• grass widow
• grass widower
• grass wrack
• grass-covered
• grass-eating
• grass-leaved golden aster
• grass-of-Parnassus
• grassfinch
• grassfire
• grasshopper
• grasshopper mouse
• grassland
• grassless
• grasslike
• grassroots
• grassy
• grassy death camas
• grassy-leafed
• grassy-leaved
• grate
• grated cheese
• grateful