1. A pouch or sac in certain animals (especially insects and arachnids) that contains or protects eggs.
Usage: biology; zoology

Examples

• The spider carefully guarded her ovisac, which hung from the corner of the web.
• Entomologists study the ovisac of various insect species to understand reproductive strategies.
• The ovisac of the tick contains hundreds of developing eggs.
• When the ovisac ruptures, the newly hatched spiderlings disperse into the environment.