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
A2 a large strong building, built in the past by a ruler or important person to protect the people inside from attack. âº informal for rook noun. More examples. In addition to his flat in London, he has a villa in Italy and a castle in Scotland.