'tree-covered' originates from the combination of 'tree' and 'covered', where 'tree' refers to a perennial plant with an elongated stem, and 'covered' means to be overlaid or enclosed.

'tree-covered' evolved from the Old English word 'trēow' for 'tree' and the Middle English 'coveren' for 'covered', eventually forming the modern English compound adjective 'tree-covered'.

Initially, it meant 'covered with trees', and this meaning has largely remained the same in modern usage.