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Definition of predentary in US English:

predentary

adjective

Zoology

  • Designating a bone situated in front of the dentary bone in some non-mammalian vertebrates (especially ornithischian dinosaurs).

noun

Zoology

  • A predentary bone.

Origin

Late 19th century; earliest use found in Henry Nicholson (1844–1899), biologist and geologist.