Any of various armored ornithiscian dinosaurs of the group Thyreophora from the Jurassic and Cretaceous Periods, bearing bony plates or spikes, and including the ankylosaurians and the stegosaurians.
Origin of thyreophoran
- New Latin Thyreophora taxon name Greek thureos oblong shield thyroid Greek -phora neuter pl. of -phoros -phore
From American Heritage Dictionary of the English Language, 5th Edition