fair·wa·ter 
(fârwô′tər, -wŏt′ər)
(fârwô′tər, -wŏt′ər)n.
Nautical
Nautical
1. A device used to fair the lines of an underwater fitting.
2. A streamlined superstructure on a submarine, holding the bridge and sometimes a conning tower.
fairwaterGerman submarine U33