From the outside, the old timber house looked dilapidated, but the interior was surprisingly solid and well-maintained.

timber 是名词，指"木材、木料"，特指用于建筑或木工的木料。这个词来自古英语，与德语"Zimmer"（房间）同源，因为传统上房屋多用木材建造。在建筑领域，timber house就是指用木材为主要建筑材料建造的房屋。