The term 'walleye' is a transparent English compound formed from two native Germanic words. The first element, 'wall,' does not refer to a physical structure but leverages its sense of something solid and opaque to describe the fish's distinctive, clouded, light-reflecting eye, which resembles a milky wall. The second element, 'eye,' directly names the anatomical feature. This descriptive name was later applied in medicine to a condition (strabismus) where the eye turns outward, giving a blank or 'wall-like' appearance. The logic of the term is vividly pictorial, connecting observable physical traits to familiar vocabulary.

Structure: wall + eye wall: From Old English weall, meaning a wall or a barrier. In this compound, it functions metaphorically to describe an opaque, reflective surface. eye: From Old English ēage, meaning the organ of sight. It functions as the core noun denoting the body part or its appearance.