What is the rest of word prefix ameb?

The word prefix "ameb" is most likely a misspelling of "amebo-", which is a prefix meaning "amoeba-like" or "relating to amoebas".

For example:

* Ameboid: Referring to cells that move like amoebas.

* Ameboma: A tumor that resembles an amoeba.

If you have a specific word in mind, please provide it, and I can help you understand its meaning.