| Noun | 1. | formative cell - a cell of an embryo cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals blastocyte - an undifferentiated embryonic cell ameloblast - a cell from which tooth enamel develops bone-forming cell, osteoblast - a cell from which bone develops erythroblast - a nucleated cell in bone marrow from which red blood cells develop fibroblast - a cell from which connective tissue develops neuroblast - a cell from which a nerve cell develops |