[{"Bold_text": "noun", "List Items": ["Machinery.Also called chainwheel ,.a toothed wheel engaging with a conveyor or power chain.one tooth of such a wheel.", "Also called chainwheel ,.a toothed wheel engaging with a conveyor or power chain.", "one tooth of such a wheel.", "Carpentry.a wedge-shaped piece of wood extending a sloping roof over the eaves with a flatter pitch."]}]