AMPHIBOLOGY or AMPHIBOLY, in logic, a verbal fallacy arising from ambiguity in the grammatical structure of a sentence (Aristotle, Organon, Sopla. El., ch. iv.). It occurs fre quently in poetry, owing to the alteration for metrical reasons of the natural order of words ; Jevons quotes as an example Shakespeare, Henry VI.: "The duke yet lives that Henry shall depose." The success of ancient oracles was largely due to skill in amphibology.