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 History of this Word

"ac" is from "akos" spoken by people of Greece starting about 1000 B.C.

Notes

In this sense, it is a word added to another word to form a new word.

More words with this suffix,
insomniac
amnesiac
hypochondriac
maniac.

Words related to this meaning

grammar is modifier

"-ac" is a type of suffix

Definition

A word ending used to indicate a person or thing affected by the condition. Created by people to expand meaning of words. Can be added to the end of many words.

Examples of how the word is used

-ac illustration Nevertheless insomniac patients are surprisingly wakeful people even though they don't sleep well at night.
-ac illustration Cardiac yoga classes for heart patients have been highly recommended.