Onu- (sometimes abbreviated as Nu-) was a Matoran prefix meaning "earth". When used, it denoted that the object of its reference was associated with earth and/or the Element of Earth in particular. The prefix could also be incorporated into names.


Nuhvok, Bohrok of Earth

Elemental Prefixes
Regular Elements: Ta- • Ga- • Le- • Po- • Onu- • Ko-
Moral Elements: Av- • Kra-
Secondary Elements: Fe- • De- • Ba- • Ce- • Vo- • Su- • Fa- • Bo-
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