flynet noun2 •A net to catch flies or used as a protection against flies, as in an open window to prevent their entrance.The Pope declares me guilty of treason; he is using a flynet to catch an eagle. — 1911 •A fringe or net used to protect a horse from flies.A small polished wooden rocking-horse, of about 1830, in the American Museum at Bath, wears a fly-net over its back. Other small horses may have this idea carried out in brush strokes. — 1971 formsflynets