Definition of -ac in English:

-ac

suffix

Forming adjectives which are often also (or only) used as nouns, such as maniac. Compare with -acal.

Origin

via Latin -acus or French -aque from Greek -akos.

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Definition of -ac in:

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Word of the day erroneous
Pronunciation: ɪˈrəʊnɪəs
adjective
wrong; incorrect