1. A winter shelter or resting place, especially one used by animals during hibernation.
Usage: formal; biology
2. In botany, a bud or other plant structure that survives winter and allows the plant to regrow in spring.
Usage: technical; botany

Examples

• Bears prepare their hibernaculum deep within caves before winter arrives.
• The squirrel's hibernaculum was lined with leaves and twigs for insulation.
• Many insects seek out a hibernaculum in tree bark or soil to survive the cold months.
• The plant's hibernaculum allows it to endure freezing temperatures underground.
• Scientists studied the hibernaculum of dormice to understand their winter survival strategies.