microbe[noun]Synonyms: microorganism, bacillus, bacterium, bug 
(informal), germ, virus 
 [TahlilGaran] English Synonym Dictionary ▲
 mi‧crobe /ˈmaɪkrəʊb $ -kroʊb/ 
 noun [countable][
Date: 1800-1900; 
Origin: micro- + Greek bios 'life']
 an extremely small living thing which you can only see if you use a 
microscope. Some microbes can cause diseases. 
 [TahlilGaran] Dictionary of Contemporary English ▲