self-multiplying

adjective
UK /ˌself ˈmʌltɪplaɪɪŋ/
US /ˌself ˈmʌltəplaɪɪŋ/

Something that makes more of itself all by itself.

The self-multiplying toy robots kept making copies of themselves until the room was full.


OTHER MEANINGS

2. Growing in number very quickly, like a chain reaction.

The rumor was self-multiplying, spreading to every classroom by lunchtime.

3. In math, a number that keeps multiplying by itself.

A self-multiplying pattern of twos gives 2, 4, 8, 16, and so on.

4. Able to copy itself without help from outside.

The self-multiplying cells divided again and again in the dish.