Retin-A (tretinoin) is a form of vitamin A that helps the skin renew itself. The Retin-A and Avita brands of tretinoin are used to treat acne. The Renova brand of tretinoin is used to reduce the appearance of fine wrinkles and mottled skin discoloration, and to make rough facial skin feel smoother. Retin-A may also be used for purposes not listed in this medication guide.
Waste Stream. The total flow of solid waste from homes, businesses, institutions, and manufacturing plants that is recycled, burned, or disposed of in landfills, or segments thereof such as the residential waste stream or the recyclable waste stream..
Definition of stream. 1  intransitive verb. 2  1a : to flow in or as if in a streamb : to leave a bright trail a meteor streamed through the sky. 3  2a : to exude a bodily fluid profusely her eyes were streamingb : to become wet with a discharge of bodily fluid streaming with perspiration. 4  3 : to trail out at full length her hair streaming back as she ran.