flightmare noun2 •An unpleasant flight or experience during air travel.She glanced, for the first time since this flightmare started, to the man sitting in the aisle seat beside her. — 2011 •A type of dragon with poisonous breath that feeds on luminous algae.Flames like flightmare algae hidden within the enclaves of a kaleidoscope illusion, a gateway into the god's secret treasure chest. — 2020 formsflightmares