noun, verb ·Rare ·Advanced level

Definitions

Noun

1. 1
   An underground drain or trench with openings through which the water may percolate from the soil or ground above.

Verb

1. 1
   To drain by forming an underdrain or underdrains in. transitive

Synonyms

All synonyms

underdrainer

Etymology

From under- + drain.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.