sand pipe
noun
1
: a pipe containing sand or serving as a channel for sand (as on a locomotive)
2
: a tubular cavity from a few inches to many feet in depth formed by solution especially in calcareous rocks and often filled with gravel and sand
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“Sand pipe.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sand%20pipe. Accessed 28 Nov. 2024.
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