seco - shaf
- second
- second bower
- second futtock
- second high water
- second in command
- second law of motion
- second law of thermodynamics
- second low water
- second mate
- second mode of vibration
- second moment
- second moment of area
- second moment of free water surface
- second moment of mass
- second moment of the waterplane
- second root
- second-class cabin
- second-order theory
- secondary cell
- secondary compass
- secondary conning station
- secondary cyclone
- secondary motion
- secondary pinion
- secondary piping
- secondary pitching
- secondary plant
- secondary port
- secondary ports
- secondary propulsion motor
- secondary propulsion system
- secondary relay
- secondary rudder
- secondary shield
- secondary shielding
- secondary signal bridge
- secondary station
- secondary steering stand
- secondary stress
- secondary superheater
