noun
A downward-growing, hollow tube of ice found in polar seas, formed by the release of cold, saline water from sea ice
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A brinicle is a downward-growing hollow tube of ice enclosing a column of brine that forms beneath sea ice.
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Watch out for the brinicle forming under the ice, it's like an underwater icicle!
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I can't believe how cool that brinicle looks, like nature's own ice sculpture!
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The silence in the room was so cold, it felt like a brinicle had formed between us.