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	Eng ID	Term	Definition
	3761	pendulum: working	A PENDULUM which is used (swung) in a determination of the INTENSITY OF GRAVITY.
	3762	pendulum sextant	See SEXTANT.
	3763	peninsula	A piece of LAND that is almost an ISLAND, being nearly surrounded by water; by extension any piece of LAND projecting into the SEA, so that ... more A piece of LAND that is almost an ISLAND, being nearly surrounded by water; by extension any piece of LAND projecting into the SEA, so that the greater part of its BOUNDARY is COASTLINE.
	3764	peninsula: submarine	An elevated portion of the SUBMARINE RELIEF resembling a PENINSULA. The opposite is SAC.
	3765	perch	A staff placed on top of a BUOY, ROCK, or SHOAL as a MARK for navigators. A ball or cage is sometimes placed at the top of the perch, as an ... more A staff placed on top of a BUOY, ROCK, or SHOAL as a MARK for navigators. A ball or cage is sometimes placed at the top of the perch, as an identifying MARK. A unit of length equal to 5.5 YARDS or 16.5 FEET. Also called ROD, POLE.
	3766	percolation	The process by which water is forced by wave action through the interstices of the bottom sediment and has a tendency to reduce WAVE HEIGH... more The process by which water is forced by wave action through the interstices of the bottom sediment and has a tendency to reduce WAVE HEIGHTS.
	3767	perigean range (of tide)	The average of all monthly TIDE RANGES occurring at the TIME of PERIGEE. It is larger than the MEAN RANGE, where the TYPE OF TIDE is either ... more The average of all monthly TIDE RANGES occurring at the TIME of PERIGEE. It is larger than the MEAN RANGE, where the TYPE OF TIDE is either semidiurnal or mixed, and is of no practical significance where the TYPE OF TIDE is diurnal.
	3768	perigean tides	See TIDE.
	3769	perigee	That orbital point nearest the EARTH when the EARTH is the centre of attraction, as opposed to APOGEE.
	3770	perihelion	That orbital point nearest the SUN, when the SUN is the centre of attraction, as opposed to APHELION.
	3771	period	The interval needed to complete a CYCLE. Any specified duration of time.
	3772	period (of a navigational light)	The TIME taken to exhibit one complete sequence of intervals of light and darkness.
	3773	periodic current	See CURRENT.
	3774	periodic error	See ERROR.
	3775	periodic wave(s)	See WAVE.
	3776	peripheral equipment	In computer systems, any unit of equipment, distinct from the central unit, which may provide the system with outside communication.
	3777	permafrost	A LAYER of SOIL or BEDROCK at a variable depth beneath the surface of the EARTH in which the temperature has been below freezing continuousl... more A LAYER of SOIL or BEDROCK at a variable depth beneath the surface of the EARTH in which the temperature has been below freezing continuously from a few to several thousands of years. Permafrost exists where the summer heating fails to descend to the base of the LAYER of frozen ground.
	3778	permanent current	See CURRENT.
	3779	Permanent International Association of Navigation Congresses (PIANC)	Fosters progress of inland and maritime waterways, of ports and of coastal areas by research and information exchange.
	3780	permanent magnetism	See MAGNETISM.
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