fastness

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fast·ness

(fast'nes),
The state of tolerance exhibited by bacteria to a drug or other agent. See: fast.

fastness

[AS. faest, fixed]
The ability of cells to resist stains or destructive agents.
References in classic literature ?
The English have not been able to secure complete dominion over this territory, which is subjected to the influence of rajahs, whom it is almost impossible to reach in their inaccessible mountain fastnesses.
At the time we are treating of, the grizzly bear was still frequent on the Missouri and in the lower country, but, like some of the broken tribes of the prairie, he has gradually fallen back before his enemies, and is now chiefly to be found in the upland regions, in rugged fastnesses like those of the Black Hills and the Rocky Mountains.
A narrow alley ran past the building, ending abruptly at the bank of the Thames in a moldering wooden dock, beneath which the inky waters of the river rose and fell, lapping the decaying piles and surging far beneath the dock to the remote fastnesses inhabited by the great fierce dock rats and their fiercer human antitypes.
In the old days, he said, they had crossed the grasslands and attacked the salt-water natives; but since the coming of the white men to the coast they had remained in their interior fastnesses, and no salt-water native had ever seen them again.