Any of various aerobic bacteria of the genus Spirillum, having an elongated spiral form and bearing a tuft of flagella.(noun)
Any of various other spiral-shaped microorganisms.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "spirillum" in a sentence
"On the opposing spread there are photos of crackling staphylococcus aureus, zig-zaggy leptospira, pickle-like vibrio, frightening spirillum volutans, a decaying tree, a microscope, and . . . wait for it . . . a bighorn sheep."
"But a resting state of the comma bacilli has never been met with -- a very exceptional thing in the case of bacilli, and another reason why the organism must be regarded rather as a spirillum than a bacillus, for the spirilla require only a fluid medium, and do not, like the anthrax bacilli, thrive in a dry state."
"On account of this developmental change, he doubted if the cholera organism should be ranked with bacilli; it is rather a transitional form between the bacillus and the spirillum."