underdrain

noun

Definition of underdrain 

(Entry 1 of 2)

: 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

underdrain

transitive verb

Definition of underdrain (Entry 2 of 2)

: to drain by forming an underdrain underdrain a meadow

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History and Etymology for underdrain

Noun

under entry 3 + drain

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