The word "stuffing" originates from the verb "to stuff," which entered English from Old French estoffer meaning "to equip or furnish." This French term has deeper Germanic roots, likely related to a word meaning "to stop up" or "to plug." The core concept of filling a space tightly is central to its history. The addition of the "-ing" suffix, a productive noun-forming element in English, creates a word that specifically denotes the material used for filling or the action of putting it in place. Thus, the literal progression from an action ("to cram full") to the resultant material ("the filling itself") clearly illustrates the word's functional logic, whether applied to culinary preparations or upholstery.

Structure: stuff (to fill) + ing (noun suffix) - stuff: From Old French estoffe (material, supplies), of Germanic origin; the verbal sense "to fill tightly" developed in Middle English. Its functional role is the core root meaning "to fill or cram." - ing: A suffix of Germanic origin forming verbal nouns, indicating the action, result, or material associated with the verb.