院内

1. Origins, structure, and basic meaning

• Structure: 院内 is read as いんない and is a noun meaning inside an institution designated by 院, such as a hospital.
• Basic usage: A hospital map appears in 院内の案内図, while a garden belonging to the hospital appears in 院内の庭.

2. Common pitfalls and similar expressions

• Institution depends on context
  • The examples mean inside a hospital, but the institution represented by 院 can vary with context.
• Difference from 病院内
  • 病院内 explicitly says inside a hospital; 院内 is concise when the relevant institution is already clear.