Cell (Science: Cell biology) An Autonomous Self replicating Unit (in principle) that may constitute an Organism (in the Case of Unicellular Organisms) or be a sub Unit of Multicellular Organisms in which Individual Cells may be more or Less specialised differentiated) for Particular Functions. + - + - The Individual Units from which Tissues of the Body are Formed. All living Organisms are composed of one or more Cells. + - Any Small compartment; the Cells of a honeycomb.(biology) the Basic Structural and Functional Unit of all organisms; Cells may Exist as Independent Units of Life (as in monads) or may Form Colonies or Tissues as in higher Plants and animals.One Cell is the lowest denomination of Life thought to be Possible. Most Organisms consist of more than one Cell, which Become specialised Into Particular Functions towards the Cause of the Organism as a Whole. Cells Possess Many Structures Inside them that contain and Maintain the building Blocks of Life called Organelles. Animal Cells and Plant Cells Differ fundamentally.