1

underdrain

noun

Definition of underdrain

  1. :  a concealed drain with openings through which the water enters when the water table reaches the level of the drain an underdrain below a filter bed

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Origin and Etymology of underdrain

3under + drain


2

underdrain

transitive verb

Definition of underdrain

  1. :  to drain by forming an underdrain underdrain a meadow

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