ruby-red

the compound adjective 'ruby-red' is a straightforward combination of two ancient colour words. 'ruby' traces back to the latin 'rubeus', meaning red, which was applied to the precious stone known for its vivid crimson hue. 'red' originates from the old english 'rēad', a term with deep proto-germanic roots for the colour. the logic of the compound is transparently comparative, using the highly specific and valued colour of the gemstone to modify and intensify the general colour term 'red', resulting in a description for a deep, clear, and lustrous shade.

Structure: ruby (gemstone) + red (colour) - ruby: from old french 'rubi', from medieval latin 'rubinus', from latin 'rubeus' (red). functions as a noun used attributively to specify the type of red. - red: from old english 'rēad', of proto-germanic origin. functions as the head adjective denoting the colour.