The compound noun 'star-trail' is a modern, descriptive term from the field of astrophotography. Its first element, 'star', descends from the Proto-Germanic 'sternǭ', a term for the celestial bodies seen as fixed points of light. The second element, 'trail', originates from ideas of dragging or drawing out, entering English via medieval Germanic or Romance languages with meanings related to a track or mark left behind. The compound logically fuses these concepts: the 'star' is the source, and the 'trail' is the elongated photographic record of its apparent motion, creating a term that perfectly encapsulates the visual phenomenon of capturing the Earth's rotation through the streaked light of distant suns.

Structure: star (celestial body) + trail (path or mark) - star: From Old English 'steorra', of Germanic origin; related to Dutch 'ster' and German 'Stern'. Functions as the core noun denoting the luminous celestial object. - trail: From Middle English 'trailen', perhaps from Old French 'trailler' (to tow), or from Middle Low German 'treilen' (to haul). Functions as a noun meaning a mark, line, or path left by something that has passed.