D defs.my
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Entry 2 senses · 2 variants Webster, 1913

Underdrain

· Un·der·drain · IPA
01 n. An underground drain or trench with openings through which the water may percolate from the soil or ground above.
  1. 1.
    An underground drain or trench with openings through which the water may percolate from the soil or ground above.
02 v. t. To drain by forming an underdrain or underdrains in; as, to underdrain land.
  1. 1.
    To drain by forming an underdrain or underdrains in; as, to underdrain land.