single-edge

The compound adjective "single-edge" is a transparent combination of two native English elements. "Single" entered English via Old French from the Latin singulus, meaning "one, individual, separate," which itself derives from a Proto-Indo-European root meaning "one." "Edge" is a direct descendant from the Old English ecg, meaning "the sharp side of a blade," a term with deep Germanic roots related to sharpness and cutting. The logic of the compound is entirely literal, directly describing a blade or tool that possesses only one sharpened side, as opposed to a "double-edge." This formation exemplifies the productive Germanic practice of creating precise, descriptive compound terms.

Structure: single (one) + edge (sharp side) - single: From Latin singulus (one, individual). Functional role: Adjective/quantifier meaning "one". - edge: From Old English ecg (sharp side of a blade, border). Functional role: Noun denoting the sharpened side of a cutting implement.