Dictionary.com

bacillus

[ buh-sil-uhs ]
/ bəˈsɪl əs /
Save This Word!
See synonyms for: bacillus / bacilli on Thesaurus.com

Definition of bacillus

noun, plural ba·cil·li [buh-sil-ahy]. /bəˈsɪl aɪ/.
any rod-shaped or cylindrical bacterium of the genus Bacillus, comprising spore-producing bacteria.
(formerly) any bacterium.
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
Smoothly step over to these common grammar mistakes that trip many people up. Good luck!
Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.

Origin of bacillus

1880–85; <Late Latin, variant of Latin bacillum (diminutive of baculum) staff, walking stick
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use bacillus in a sentence

British Dictionary definitions for bacillus

bacillus
/ (bəˈsɪləs) /

noun plural -cilli (-ˈsɪlaɪ)
any rod-shaped bacterium, such as a clostridium bacteriumCompare coccus (def. 2), spirillum (def. 1)
any of various rodlike spore-producing bacteria constituting the family Bacillaceae, esp of the genus Bacillus

Word Origin for bacillus

C19: from Latin: a small staff, from baculum walking stick
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for bacillus

bacillus
[ bə-sĭləs ]

Plural bacilli (bə-sĭlī′)
Any of various pathogenic bacteria, especially one that is rod-shaped.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK