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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phrase	search for verses that contains all of the search phrase.	"fish bread" will search for verses that contains "fish bread" in minimum 1 bible version
at least one	search for verses that contains any of the search words.	"fish bread" will search for verses that contains fish OR bread in minumum 1 bible version
without	search for verses not contained of the search words. Without can not be used by it self, meaning that it has to be minimum one more condition included (all/at least one,etc)	all: "fish", without: "bread", will search for verses that contains "fish" but NOT "bread"
start	search for verses that contains words that start with the search words	"fis" will search for verses that contains words start with "fis", the result will be "fish", "fishing", "fisherman", etc
similar	search for verses that contains words that similar in spelling to the search words.	"fish" will search verses that contain words which has similar spelling with fish. The result: "dish",etc
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