Woodworm is the wood-eating larvae of any of many species of beetle. It is also a generic description given to the infestation of a wooden item by these larvae.
Signs of woodworm usually consist of holes in the wooden item, with live infestations showing powder (faeces) around the holes.
The size of the holes varies, but is typically 1mm to 1.5mm in diameter for the most common household species. Adult beetles, which emerged, from the wood may also be found in the summer months.