\Bat"tle*door`\, n. [OE. batyldour. A corrupted form
of uncertain origin; cf. Sp. batallador a great combatant, he
who has fought many battles, Pg. batalhador, Pr. batalhador,
warrior, soldier, fr. L. battalia; or cf. Pr. batedor batlet,
fr. batre to beat, fr. L. batuere. See {Battle}, n.]
1. An instrument, with a handle and a flat part covered with
   parchment or crossed with catgut, used to strike a
   shuttlecock in play; also, the play of battledoor and
   shuttlecock.
2. [OE. battleder.] A child's hornbook. [Obs.] --Halliwell.