'timberwork' originates from Old English, specifically the word 'timberweorc', where 'timber' meant 'wood' and 'weorc' meant 'work'.

'timberweorc' transformed into the Middle English word 'timberwerk', and eventually became the modern English word 'timberwork'.

Initially, it meant 'work done with wood', but over time it evolved into its current meaning of 'construction or structure made of timber'.