Sentence:  He is all white lak de moon on de watair. He come not often, oh, ver' seldom." "What !" cried I, "is he a <WSD>ghost moose</WSD>?" "Yaas, jes' so — a <WSD>ghost moose</WSD>." 
Meaning of the word marked with <WSD> tags:  (spirit moose) (a white moose)