megastructure noun4 •A very large structure.I never cared for zipways as a way to get around megastructures like this. I always thought that there was a reason God invented taxis. — 2006 •A specific type of structure characterized by very large buildings with strictly artificial forms.A fusion of architecture and city planning, megastructures were supposed to bring together mixed uses -- like housing, shopping, transportation and public space -- within a single building. — 1993 •A hypothetical structure not possible with current technology, e.g., a Dyson sphere.For lack of anything intelligent to do (it's a slow weekend), I've been compiling a list of stories about "megastructures" -- ringworlds, Dyson spheres, and so forth. — 1993 •The large-scale structure of a material, as contrasted to the fine-scale structure. formsmegastructures