Sentence:  Fairway then lit a lantern, tied it to another cord, and began lowering it into the well beside the first. Clym came forward and looked down. Strange humid leaves, which knew nothing of the seasons of the year, and quaint-natured mosses were revealed on the <WSD>wellside</WSD> as the lantern descended ... 
Meaning of the word marked with <WSD> tags:  The side of a well.