esker

This term is a specialized geological descriptor used primarily in glaciology and physical geography. It describes a specific landform created by subglacial meltwater, distinguishing it from other glacial deposits like moraines, which are typically unsorted and deposited by the ice itself rather than by flowing water.

In a professional or academic context, the word carries a neutral, descriptive tone. Because it refers to a distinct physical structure, it is used almost exclusively in scientific reports, textbooks, or field guides describing post-glacial landscapes, particularly in regions like Scandinavia, Canada, and the northern United States.