1. plural of atrium; the upper chambers of the heart that receive blood from veins
Usage: anatomy
2. plural of atrium; large open spaces or courtyards in buildings, often with glass roofs
Usage: architecture

Examples

• The atria of the heart fill with blood before contracting.
• Both atria must function properly for healthy circulation.
• The hospital’s atria provide natural light to the corridors.
• Modern office buildings often feature glass-covered atria.
• The shopping mall’s central atria serve as gathering spaces.
• Blood flows from the atria to the ventricles during each heartbeat.