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noun, plural: organisms. An individual living thing that can react to stimuli, reproduce, grow, and maintain homeostasis
Organisms may also be grouped based on their cellular composition. A single-celled organism is one that consists of only one cell. In contrast, a multicellular organism is one that is comprised of more than one cell and whose cells are organized into tissues, organs, and then into systems. Word origin: Greek organon (instrument) Synonym(s): life form; living thing; living being; See also: life; living thing; prokaryote; eukaryote