selvage

1. (weaving) The edge of a woven fabric, where the weft (side-to-side) threads run around the warp (top to bottom) threads, creating a finished edge.countableuncountable

2. (printing) The excess area of any printed or perforated sheet, such as the border on a sheet of postage stamps or the wide margins of an engraving.countableuncountable

3. (geology) A distinct border of a mass of igneous rock. It is usually fine-grained or glassy due to rapid cooling.countableuncountable

4. (geology) Clay-like material found along and around a geological fault.countableuncountable

5. (mining) That part of a lode adjacent to the walls on either side.countableuncountable