'timber-related' is a compound word formed in English from 'timber' and the suffix '-related', where 'timber' means 'wood prepared for use in building' and '-related' means 'connected to'.

The word 'timber' comes from Old English 'timber', and '-related' is a modern English suffix. The compound 'timber-related' emerged in modern English to describe things associated with timber.

Initially, it simply meant 'connected to timber', and this meaning has remained unchanged.