Definition of sewer

• n. - One who sews, or stitches.
• n. - A small tortricid moth whose larva sews together the edges of a leaf by means of silk; as, the apple-leaf sewer (Phoxopteris nubeculana)
• n. - A drain or passage to carry off water and filth under ground; a subterraneous channel, particularly in cities.
• n. - Formerly, an upper servant, or household officer, who set on and removed the dishes at a feast, and who also brought water for the hands of the guests.