Somatic cells. Definition. noun, singular: somatic cell. The word “somatic” is derived from the Greek word soma, meaning “body”. Hence, all body cells of an organism – apart from the sperm and egg cells, the cells from which they arise (gametocytes) and undifferentiated stem cells – are somatic cells.xamples of somatic cells are cells of internal organs, skin, bones, blood and connective tissues. In comparison, the somatic cells contain a full set of chromosomes whereas the reproductive cells contain only half. Word origin: Gk sōmatikos sōmatikós = of pertaining to the. Body: synonym body. cells