Zoology and Palaeontology a bone forming part of the rostrum or snout of various vertebrates; specifically a bone located in front of the premaxillary bones in a ceratopsian dinosaur, forming the upper part of a parrot-like beak.
Origin
Late Middle English.
Definition of rostral bone in US English:
rostral bone
noun
Zoology and Palaeontology a bone forming part of the rostrum or snout of various vertebrates; specifically a bone located in front of the premaxillary bones in a ceratopsian dinosaur, forming the upper part of a parrot-like beak.