ˈsea-bladder †1. The bladder-wrack. Cf. next 1. Obs. 1681Grew Musæum ii. §v. ii. 250 The Roped Sea-Bladder..is also wrought with fibrous Veins, as the former. 2. The Portuguese man-of-war. 1860Wraxall Life in Sea x. 243 The Physaliæ, or Sea⁓bladders.