Definitions

1. noun

A posterior part of an arthropod’s body, especially the hind part of an insect’s abdomen or the tail of a crustacean.

“The fossilized pygidium of the ancient insect provided valuable information about its evolutionary history.”

2. noun

In anatomy, it refers to a pygidal or caudal region of an animal’s body.

“The veterinarian examined the cat’s pygidium to check for any potential health issues.”