1. of, relating to, or belonging to the pygidium (the posterior body region of trilobites and other arthropods)
Usage: technical; paleontology; zoology

Examples

• The pygidial lobes of the trilobite were clearly visible under the microscope.
• Paleontologists examined the pygidial structure to classify the specimen.
• The pygidial spines extended backward from the arthropod's body.
• Differences in pygidial morphology helped distinguish between species.
• The fossil showed well-preserved pygidial segments.