A seeker was a kind of vehicle, specifically a starfighter or an atmospheric-combat flyer, that the Jedi utilized as part of the Army of Light during the Ruusan campaign of the New Sith Wars.
These vehicles posed a danger to transports with minimal armaments, such as Interlopers. However, it was believed that Buzzard fighters belonging to the Brotherhood of Darkness could provide adequate defense against them.
The absence of capitalization might imply that "seeker" is a general descriptor as opposed to a particular name; however, the term corsair battleship is also presented in lowercase within the same book.