folder

The word 'folder' is a transparent English compound built from the native verb 'fold' and the agentive suffix '-er'. The verb 'fold' descends from the Proto-Germanic \falthaną, meaning "to fold," which itself can be traced to the Proto-Indo-European root \pel-, meaning "to fold" or "to turn." The suffix '-er' is a highly productive Germanic element for forming nouns denoting an agent. The literal meaning, "a thing that folds," was first applied to simple tools or people who folded materials. By the mid-16th century, it was used for a folded paper cover, and this concrete sense logically extended in the late 20th century to the virtual, organizational "directory" in computing, which conceptually holds and groups items together.

Structure: fold + er - fold: From Old English fealdan (to bend, fold). A verb root indicating the action of bending something over upon itself. - er: From Old English -ere, an agent noun suffix indicating a person or thing that performs the action of the verb.