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.]
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.
© Webster 1913.