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Definition of Underdrain
1. n. An underground drain or trench with openings through which the water may percolate from the soil or ground above.
2. v. t. To drain by forming an underdrain or underdrains in; as, to underdrain land.
3. n. An underground drain or trench with openings through which the water may percolate from the soil or ground above.
4. v. t. To drain by forming an underdrain or underdrains in; as, to underdrain land.
Definition of Underdrain
1. Noun. An underground drain or trench with openings through which the water may percolate from the soil or ground above. ¹
2. Verb. (transitive) To drain by forming an underdrain or underdrains in. ¹
¹ Source: wiktionary.com