Anyone who works long enough with words, eventually starts to invent new ones.  Just ask yourself what is the word for reverse entropy or look up entropy antonyms in the dictionary or thesaurus. Not there? Then what would be the right word based on established etymology?

Hence, I present to you the word “RETROPY,” as the title of this haiku and offer it for use to physicists studying tachyons, a word that was itself recently coined in the Sixties.

RETROPY

Sometimes particles

can go faster than light speed

and backwards in time.