# cactoid

Definition from Wiktionary, the free dictionary

## English[edit]

### Noun[edit]

**cactoid** (*plural* **cactoids**)

- A member of the cactus subfamily Cactoideae.
- (topology)
*This term needs a definition. Please help out and***add a definition**, then remove the text`{{rfdef}}`

.**1951**, John William Theodore Youngs,*The Representation Problem for Fréchet Surfaces*(page 27)- It is well known that a Peano space is a
**cactoid**if and only if each of its true cyclic elements is a 2-sphere.

- It is well known that a Peano space is a