Bible Dictionaries
Underdrain

Webster's Dictionary

(1):

(v. t.) To drain by forming an underdrain or underdrains in; as, to underdrain land.

(2):

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

Bibliography Information
Webster, Noah. Entry for 'Underdrain'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/underdrain.html. 1828.