Use Retin-A exactly as your doctor has prescribed it for you. Follow all directions on your prescription label. Do not use this medicine in larger or smaller amounts or for longer than recommended. Do not take by mouth. Retin-A is for use only on the skin.
Definition of wall for English Language Learners : a structure of brick, stone, etc., that surrounds an area or separates one area from another : the structure that forms the side of a room or building
Also found in: Wikipedia. A wall that resists shear forces in its own plane due to wind or earthquake forces. See also: screen wall. 1. A wall which in its own plane carries shear, 1 resulting from forces such as wind, blast, or earthquake. 2. A wall that abuts another wall at a right angle to it and supports it.