Longman Dictionary of Contemporary English - bacteria
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Bacteria
bacteria
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1.
Bacteria are very small organisms. Some bacteria can cause disease. Chlorine is added to kill bacteria. N-PLURAL ...Collins COBUILD Advanced Learner's English Dictionary
2.
noun (plural ~; also -rias) Etymology: plural of bacterium Date: 1881 bacterium — not usually used technically Usage: Bacteria is regularly a plural in scientific and pedagogical use; in speech and in journalism it is also used as a singular, and it is sometimes pluralized as ~s caused by a ~ borne by certain tiny ticks — Wall Street Journal more resistant to chlorine and elevated water temperatures than other ~s — Allan Bruckheim, M.D., Chicago Tribune. These journalistic uses are found in British as well as American sources. ...Merriam-Webster Collegiate Dictionary
Толковый словарь английского языка Oxford English Reference
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5.
- 1847, from Mod.L. pl. of bacterium, from Gk. bakterion "small staff," dim. of baktron "stick, rod," from PIE *bak- "staff used for support." So called because the first ones observed were rod-shaped. ...Английский Этимологический словарь
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