underdrain

underdrain
n. /un"deuhr drayn'/; v. /un'deuhr drayn"/, n.
1. a drain placed beneath the surface of cultivated fields, streets, etc.
v.t.
2. to equip or supply with an underdrain or underdrains.
[1795-1805; UNDER- + DRAIN]

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Universalium. 2010.

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