noun🔗ShareThe supporting part of a structure (either physical or organizational; the foundation)."The school's substructures, including the foundation and supporting walls, were reinforced during the summer renovation. "structureorganizationpartbuildingChat with AIVocabulary GamePractice Reading
noun🔗ShareThe earth or gravel that the railway tracks are embedded in."After the heavy rains, engineers inspected the substructures of the railway line for any signs of erosion that could cause a derailment. "materialgeologystructurebuildingtechnicalChat with AIVocabulary GamePractice Reading
