The Collaborative International Dictionary
Sciomachy
Sciomachy \Sci*om"a*chy\, n. [Gr. ?, ?; ? a shadow + ? battle:
cf. F. sciomachie, sciamachie.]
A fighting with a shadow; a mock contest; an imaginary or
futile combat. [Written also scimachy.]
--Cowley.
Wiktionary
sciomachy
n. battling an imaginary enemy