n
(underwater diving, historical) A predecessor of the aqualung, invented by Benoit Rouquayrol and Auguste Denayrouze 1865
n
(underwater diving) A piece of equipment consisting of an oxygen tank and breathing apparatus used by divers to allow them to breathe underwater at depth.
n
An inflatable plastic band, normally worn on the upper arm, to help a wearer float in water and learn to swim.
n
(surfing) The situation where an incoming wave passes from shallower water to a deeper area, making the wave less steep and potentially unsurfable.
n
(underwater diving) A plate harnessed to a diver's back, to which the gas cylinders are attached.
n
(underwater diving) A backup supply of air in scuba diving.
v
(intransitive) To move gently and vertically, in either a single motion or repeatedly up and down, at or near the surface of a body of water, or similar medium.
n
(surfing) A place where waves break (that is, where waves pitch or spill forward creating white water).
n
(slang) A submariner; bubble-head.
v
(underwater diving) To share a single demand valve and thus reduce the amount of breathing gas used up by each diver during an emergency rescue.
v
(intransitive) To glide along without adding energy; to allow a vehicle to continue moving forward after disengaging the engine or ceasing to apply motive power.
n
(idiomatic, military) An emergency maneuver by a submarine in which it suddenly descends, especially to considerable depth, usually in order to escape an attack or avoid a collision.
n
(aviation) Aerial descent with the nose pointed down.
n
A boat used to gain access to a dive site
n
A rubber weight used in training either to increase a swimmer's weight or to serve as an object to be collected ("rescued") from the bottom of the pool.
n
A device, similar in appearance to a wristwatch, used by underwater divers to measure the time and depth of a dive, calculate a safe ascent profile, and avoid decompression sickness.
n
An airtight chamber, open at the bottom, that is lowered on a cable underwater to operate as a base or a means of transport for a diver or a small number of divers.
n
structure used for competitive diving, consisting of a vertical rigid tower with one or more horizontal platforms extending out over a deep pool of water.
n
An item of diving equipment used by scuba divers to increase their range while underwater.
n
Alternative spelling of diving bell [An airtight chamber, open at the bottom, that is lowered on a cable underwater to operate as a base or a means of transport for a diver or a small number of divers.]
n
Alternative spelling of diving board [A springboard used for diving into water.]
v
(obsolete, intransitive) To float.
n
An elaborately decorated trailer or vehicle, intended for display in a parade or pageant.
n
(diving) A tank-less surface air compressor pump and umbilical piping system that supplies air to a diving mask
n
A form of undersea diving in which the diver enters the water through a hole cut in the ice.
n
(search and rescue) An underwater search conducted by divers who follow a guide rope, each time they reach an end of the rope moving that end in a set direction; the divers may start together or from opposite ends of the rope.
n
The wake pattern produced by waterfowls, boats, etc. crossing water, consisting of two wake lines that form the arms of a V, with the source of the wake at the point.
n
A recreational activity involving descent into a deep ravine or watercourse.
n
(surfing) A wave breaking from left to right (viewed from the shore).
n
(surfing) An extended pause between sets of waves.
n
(surfing) The outer part of the sea, away from the peak of a wave.
n
A military operative who is dropped from an aircraft into water, combining the roles of paratrooper and frogman.
n
(underwater diving) A small diving cylinder fitted with an independent regulator, used as a backup in case of emergency.
n
A long, slender tube or rod, extruded from buoyant foam and usually brightly coloured, used as an exercise tool or toy in swimming pools.
n
figure-eight shaped piece of closed-cell foam used in swim workouts
n
(surfing, slang) A wave that breaks over a projection from the seabed formed from coral reef or rock shelf.
v
To move rapidly through water, leaving a roostertail wake.
n
(underwater diving) A diver's pause at a certain depth when ascending, to prevent decompression sickness.
n
A long duration deep dive using the saturation diving method.
n
(underwater diving) An apparatus carried by a diver, which includes a tank holding compressed, filtered air and a regulator which delivers the air to the diver at ambient pressure which can be used underwater.
n
(underwater diving) The set of equipment required by a scuba diver to be at ease when submerged for extended periods of time. Modern equipment sets include tanks containing mixes of nitrogen in varied ratios with oxygen, a buoyancy control device, a first- and second-stage regulator (to allow the regulated flow of gas from the tank into the user's respiratory system), a wetsuit and accessories for heat insulation, fins for underwater propulsion, a mask (to see underwater), and a snorkel (for moving around the surface of the water without using up breathing gas). Many divers also choose to dive with a diving knife (in case of a tangle with a net, etc.), and night divers may also dive with a waterproof flashlight.
n
A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater.
n
Alternative spelling of snow tire [(automotive) A tire with rubber that remains soft at most winter temperatures, designed to maintain grip on snow and ice (historically these tires have poor tread life on tarmac and pavement, especially in non-cold temperatures)]
n
(surfing) The foamy portion of a wave.
n
(aviation) A ballooning maneuver whereby a Montgolfier balloon is lowered down to touch a body of water and lifts off again.
n
A form of deep diving using an umbilical that supplies air, power and communications from the surface to the diver, who wears a diving helmet. This is the traditional diving with a diving helmet and air hose.
n
flipper, footwear used while swimming for more speed
n
(underwater diving) A pair of cylinders containing air for the diver to breathe.
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