TRAP n. 2 definitions
A bend, sag, or partitioned chamber, in a drain, soil pipe, sewer, etc., arranged so that the liquid contents form a seal which prevents passage of air or gas, but permits the flow of liquids.
WELL n.
l, 5 (a), above. -- Well boring, the art or process of boring an artesian well. -- Well drain. (a) A drain or vent for water, somewhat like a well or pit, serving to discharge the water of wet land. (b) A drain conducting to a well or pit. -- Well room. (a) A room where a well or spring is situated; especially, one…