名词

1. 洞;孔;腔
A cavity is a space or hole in something such as a solid object or a person's body.

2. (牙科)龋洞，蛀牙洞
In dentistry, a cavity is a hole in a tooth, caused by decay.

1. (anatomy) a natural hollow or sinus within the body

Synonym: bodily cavitycavum

2. a sizeable hole (usually in the ground)

e.g. they dug a pit to bury the body

Synonym: pit

3. soft decayed area in a tooth
progressive decay can lead to the death of a tooth

Synonym: cariesdental cariestooth decay

4. space that is surrounded by something

Synonym: enclosed space