The word 'yellowy' is a straightforward English formation, combining the native color term 'yellow' with the adjectival suffix '-y'. The root 'yellow' itself descends from the Proto-Germanic 'gelwaz', which is thought to be derived from the Proto-Indo-European root 'ghel-', meaning "to shine". This root is the source for a wide array of words for colors like yellow and green, which are associated with brightness and vegetation. The suffix '-y', originating from Old English '-ig', is a common and versatile tool for creating descriptive adjectives, literally transforming the noun 'yellow' into the quality 'yellowish' or 'somewhat yellow'. Thus, 'yellowy' represents a transparent, modern English compound built upon ancient Indo-European color terminology.

Structure: yellow (color) + y (adjective suffix) - yellow: From Old English 'geolu', 'geolwe' (yellow), of Germanic origin, related to Dutch 'geel' and German 'gelb'. It functions as the core root denoting the color. - y: A productive English suffix of Old English origin, used to form adjectives meaning "having the quality of" or "full of".