空洞
Meanings
1
A hollow space inside something, ranging from a small cavity in a wall or tooth to a larger underground cave-like space.
There was a small cavity inside the wall.
The survey found a large cavernous hollow underground.
2
noun which may take the genitive case particle 'no'
hollow; cavernous
Used before の to describe something whose inside is hollow or empty, as in 空洞の pipe, trunk, or structure.
A hollow pipe is lighter than it looks.
The old tree's trunk was hollow inside.
Usage patterns
- 〈場所〉に空洞があるthere is a cavity/hollow space in ~
There was a hollow inside the tree.
- 空洞ができるa cavity forms
As tooth decay progresses, a cavity forms in the tooth.
- 空洞の〈物〉a hollow ~ (something empty inside)
They use a hollow pipe to make the sound resonate.