ar·au·car·i·ox·y·lon \-ˌka(a)rēˈäksəˌlän, -_lən\noun Etymology: New Latin, from Araucaria + -o- + -xylon 1.capitalized: a genus of widely distributed fossil conifers of late Paleozoic to late Mesozoic time having a wood structure resembling that of modern araucarias 2.: any of several fossil woods having a structure like that of modern araucarias