underdrain

Noun, Verb (usu participle)

un=der=drain

CIDE DICTIONARY

underdrain, n.

An underground drain or trench with openings through which the water may percolate from the soil or ground above. [1913 Webster]

underdrain, v. t.

To drain by forming an underdrain or underdrains in; as, to underdrain land. [1913 Webster]

For further exploring for "underdrain" in Webster Dictionary Online

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