The word 'sunlight' is a transparent compound formed within English from its two native Germanic elements. 'Sun' derives from the Old English sunne, tracing back to the Proto-Indo-European root suh₂el-/seh₂ul-, meaning "the sun," which also gave rise to Latin sol and Greek hēlios. 'Light' comes from Old English lēoht, originating from the Proto-Indo-European root leuk-, meaning "light, brightness." The compound logically and literally denotes "the light of the sun," directly combining the source and the emitted phenomenon. Its formation follows a common Germanic pattern for creating concrete, descriptive nouns, and its meaning has remained consistently literal from its earliest use to the present day.

Structure: sun (the star) + light (brightness/illumination) - sun: From Old English sunne, of Germanic origin; related to Dutch zon and German Sonne, from an Indo-European root shared by Greek hēlios and Latin sol. Functions as the primary noun, specifying the source. - light: From Old English lēoht, līht, of Germanic origin; related to Dutch licht and German Licht, from an Indo-European root shared by Latin lux. Functions as the head noun, specifying the type of emission.