- Biology.
- the contents of a cell within the cell membrane, considered as a fundamental entity.
- the primordial living unit or cell.
- a person or thing that is formed first; original; prototype.
- the hypothetical first individual or one of the supposed first pair of a species or the like.
- a unit consisting of the living parts of a cell, including the protoplasm and cell membrane but not the vacuoles or (in plants) the cell wall
