1. The upper chamber of each half of the heart
   - atrium of the heart

Type of: atrium

• Zwinglian
• zwitterion
• Zworykin
• zydeco
• Zygnema
• Zygnemales
• Zygnemataceae
• Zygnematales
• zygo-
• Zygocactus
• Zygocactus truncatus
• zygodactyl
• zygodactyl foot
• zygoma
• zygomatic
• zygomatic arch
• zygomatic bone
• zygomatic process
• zygomorphic
• zygomorphous
• Zygomycetes
• Zygomycota
• Zygomycotina
• Zygophyllaceae
• Zygophyllum