| closed ecological system [¦klōzd ek·ǝ`läj·ǝ·kǝl ´sis·tǝm] AEROSPACE ENGINEERING A system used in spacecraft that provides for the maintenance of life in an isolated living chamber through complete reutilization of the material available, in particular, by means of a cycle wherein exhaled carbon dioxide, urine, and other waste matter are converted chemically or by photosynthesis into oxygen, water, and food. ECOLOGY A community into which a new species cannot enter due to crowding and competition. |