noun
- A chitinous or horny outer covering secreted by the ectoderm of hydroids and some other colonial marine animals.
Usage: biology; zoology; technical
Examples
- The perisarc of the hydroid colony provides structural support and protection.
- Marine biologists examined the perisarc under the microscope to identify the species.
- The perisarc is composed of a protein-like substance similar to chitin.
- As the hydroid grows, it secretes additional perisarc to form the colony's skeleton.