Definition of "cisterns" [cisterns]

• Plural form of cistern. (noun)

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• "Sources are unclear as to which of the cisterns is the older."
• "(b) Noting that the cisterns are always black, is there some kind of insulation on them, or is it simply the high volume to surface ratio of the water in the cisterns that keeps the water from heating up intolerably during the daytime?"
• "And it means using basic technology, such as cisterns under public parks and parking lots -- even in backyards -- to mimic a tree's ability to collect and hold water."