[noun] [C] - a single living plant, animal, bacterium or virusReproduction is one of the essential properties of a living organism.The illness is caused by a common organism which is carried by most people.Amoebae and bacteria are single-celled organisms.See also microorganism.
ORGANISM
Meaning of ORGANISM in English
Cambridge English vocab. Кембриджский английский словарь. 2012