cell wall /sɛl wɔːl/ noun1 •A rigid, non-living structural layer located outside the cell membrane in certain cells, such as those of plants, fungi, bacteria, and some algae, providing support, shape, and protection.Think of the cell wall as a wicker basket in which a balloon has been inflated so that it exerts pressure from the inside. Such a basket is very rigid and resistant to mechanical damage. — 2000 formscell walls · cell-walls