bluestone
/ˈbluːˌstoʊn/
noun
- A bluish-gray building stone, especially a type of sandstone or limestone used in construction and paving.
- The old church was built with local bluestone quarried from the nearby hills.
- They laid a bluestone patio in the backyard for summer barbecues.
- The city's historic sidewalks are made of worn bluestone slabs.
- A copper sulfate compound used as an agricultural fungicide or algicide.
- Farmers sometimes use bluestone to control fungus on their grapevines.
- The pond was treated with bluestone to kill the algae bloom.
- Gardeners apply bluestone sparingly to prevent blight on tomato plants.