What is Prefixal?

Prefixal definition and meaning on Dictionary terms:
Grammar. an affix placed before a word, base, or another prefix to modify a term’s meaning, as by making the term negative, as un- in unkind, by signaling repetition, as re- in reinvent, or by indicating support, as pro- in proabolition. Compatible prefixes can work together, as un- and re- in unrefundable.
something prefixed, as a title before a person’s name: She uses the prefix