The crossword solution for the term 'BATH TISSUE PACKAGING WORD' is PLY, which is a three-letter word. PLY is a term used to describe the number of layers in a material, such as paper or fabric. In the context of bath tissue packaging, PLY refers to the number of layers of tissue in a single roll. For example, a two-PLY roll of bath tissue would have two layers of tissue, while a four-PLY roll would have four layers.