-fast

-fast
1. an adjective suffix meaning `lasting', `not fading', as in colourfast.

2. a suffix forming adjectives, usually hyphenated, that indicate that an organism, as a bacillus, is resistant to the stain-removing or toxic action of a specified agent, as in acid-fast.
{suffix formed form fast1 (def. 12)

Australian English dictionary. 2014.


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