bacteria
UK[bækˈtɪəriə]US[bækˈtɪriə]
n
microscopic living organisms, some of which can cause disease
n
(plural of bacterium) a single-celled microorganism lacking a distinct nucleus
Etymology
the word 'bacteria' is the plural of the new latin 'bacterium', which was coined in the 19th century from the greek 'baktērion', a diminutive of 'baktron' meaning 'staff' or 'stick'. this naming reflects the rod-like shape of the first observed bacteria under a microscope. the greek root 'baktron' itself may trace back to the proto-indo-european base meaning 'to split' or 'pointed stick'. the term's journey from describing a simple physical shape in greek to denoting a vast domain of microscopic life illustrates how scientific discovery repurposes ancient words to categorize new phenomena.
Analysis
the word is a modern latin plural form adopted as a singular collective noun in english. it is not productively segmented into smaller, meaningful english morphemes.
Examples
harmful bacteria in the water supply caused an outbreak of illness.
yogurt contains live bacteria that are beneficial for gut health.
the biologist studied how the bacteria rapidly multiplied in the nutrient-rich medium.