Sentence:  The <WSD>Ents</WSD> are a race of giant, tree-like people.  Their purpose is to protect the electrons, though some align themselves with holes.  However, as the great arrays have grown, the number of <WSD>Ents</WSD> has dwindled.  Now they are said only to be found in the darkest and most mysterious of laboratories. 
Meaning of the word marked with <WSD> tags:  A fictional, large, humanoid, mobile talking tree in works by J. R. R. Tolkien.