A combining form is a word root plus a vowel.
There are different kinds of word formation in English. The Combining Forms is known to be a term that is often used in the combination of a word root as well as a vowel.
Note that a vowel is seen as a kind of letter that is known to stand for an open sound.
Note also that there are six vowels in the English language which are: a, e, i, o, u. The vocal sounds is seen or is one that is depicted by vowels are open and it is one that do not have friction.
Therefore, based on the above, A combining form is a word root plus a vowel.
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