A rapier or sword. So called from Bilbaʹo, in Spain, once famous for its finely-tempered blades. Falstaff says to Ford:
“I suffered the pangs of three several deaths; first, an intolerable fright, to be detected … next, to be compassed, like a good bilbo … hilt to point, heel to head; and then …”—Merry Wives, iii. 5.