|ər|gastik adjective
Etymology: Greek ergastikos able to work, industrious, from (assumed) ergastos (verbal of ergazesthai to work) + -ikos -ic
: constituting the nonliving by-products of protoplasmic activity
ergastic materials
— used chiefly of intracellular deposits (as of starch or fat) or of extracellular secretions; compare metaplasm