noun \ˈfas(t)-nəs\

Definition of FASTNESS

: resistance (as of an organism) to the action of a usually toxic substance <streptomycin fastness developed by a strain of tubercule bacillus>

Seen & Heard

What made you want to look up fastness? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More