what does organism mean
Organism. Definition. noun, plural: organisms. (Science: Biology). An individual living thing that can react to stimuli, reproduce, grow, and maintain homeostasis. It can be a virus, bacterium, protist, fungus, plant or an animal.Supplement. Word origin: Greek organon = instrument.rganism. Definition. noun, plural: organisms. (Science: Biology). An individual living thing that can react to stimuli, reproduce, grow, and maintain homeostasis. It can be a virus, bacterium, protist, fungus, plant or an animal. Supplement. Word origin: Greek organon = instrument.