double-paned

The term 'double-paned' is a modern technical compound describing a specific architectural feature. Its first element, 'double,' traces back to the Latin duplus, meaning "twofold," directly indicating the quantity of the component layers. The second element, 'paned,' derives from 'pane,' a word for a sheet of glass, which historically evolved from the Latin pannus (a piece of cloth), reflecting a semantic shift from fabric to a flat, sheet-like section of material, specifically glass. Thus, the word's literal construction, "having two panes (of glass)," logically builds its modern meaning of an insulating window unit comprising two separate glass sheets.

Structure: double (twofold) + paned (having panes) - double: From Latin duplus (twofold, double). In this compound, it functions as a modifier meaning "consisting of two." - paned: From the English word pane (a single sheet of glass in a window) + the suffix -ed, which forms adjectives meaning "having, provided with." Pane itself originates from Old French pan (section, piece) and ultimately Latin pannus (cloth, piece of cloth).