SeaStar may refer to either of two unrelated two-seat flying boats of composite construction: the AAC SeaStar, a biplane from Canada the SeaStar Aircraft SeaStar, a monoplane from Hungary SeaStar may also refer to: SeaStar, the satellite hosting the SeaWiFS instrument SeaStar, the communications processors in Cray XT3 and XT4 supercomputers… (More on Seastar)