free·div·ing or free diving 
(frēdī′vĭng)
(frēdī′vĭng)n.
Surface diving or underwater swimming without the use of an artificial breathing apparatus, especially the sport of surface diving as deeply as possible on a single breath of air.
free dive n. & v.
- sidereal month
- sidereal time
- sidereal year
- siderite
- sideritic
- SI-derived unit
- sidero-
- siderochrome
- siderocyte
- siderophile
- siderosis
- sidesaddle
- sideshow
- sideslip
- sidespin
- sidesplitter
- sidesplitting
- sidesplittingly
- sidestep
- sidestepper
- side-straddle hop
- sidestream smoke
- sidestroke
- sidestroker
- sideswipe