What is the maori word for twin?

There isn't one single Māori word for "twin". The most common way to say it is:

* Tāua: This literally means "we two" and is used to refer to twins, especially identical twins.

Other options include:

* Whānau rua: This means "two born", a more literal translation of "twins".

* Tāua mātua: This means "our parents", and can be used to refer to twins, especially when emphasizing their shared parentage.

The best choice will depend on the context and the specific meaning you want to convey.