Definitions

1. noun

A tough, protective, usually transparent or translucent, membrane or layer, especially one surrounding the pupa of certain insects, such as moths and butterflies.

“The butterfly emerged from its chrysalis, leaving behind the fragile perisarc.”

2. noun

A similar membrane or layer in certain other organisms, such as annelid worms.

“The perisarc of the earthworm was composed of a thick, protective cuticle.”