Sentence:  But other categories of word-play have not been researched extensively or systematically. Among the latter is the type of word-play known as polysemous parallelism, or more commonly, <WSD>Janus</WSD> parallelism. The latter term was coined by w:Cyrus H. Gordon 
Meaning of the word marked with <WSD> tags:  (faces (such as animals with diprosopus) or aspects; or made of two different materials; or having a two-way action.)