These are historic definitions. You can see them in old dictionaries, e.g. the first definition of lumber is "disused furniture and the like" in the older editi

These are historic definitions. You can see them in old dictionaries, e.g. the first definition of lumber is "disused furniture and the like" in the older editions of the OED. The 3rd definition is timber sawn into planks and called out as being North American usage. And the 2nd definition of "superfluous fat, Esp. In horses" seems extremely dead to me.