underdrain

underdrain is defined in Webster's Unabridged Dictionary (1913) with 2 senses. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.An underground drain or trench with openings through which the water may percolate from the soil or ground above.
  2. 2.To drain by forming an underdrain or underdrains in; as, to underdrain land.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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