Nomial

Somehow, I used not to understand the suffix nomial in words e.g. multinomial, binomial, polynomial.

It seems, most of the time, that the suffix nomial was only used in mathmatical words, means

a name or term

Also, see the differences between multinomial and polynomial[3].

References:
1. http://en.wiktionary.org/wiki/nomial
2. History of the Word “Polynomial”
3. https://answers.yahoo.com/question/index?qid=20110704052244AAOAtDi