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Total record count: 6269.

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	Eng ID	Term	Definition
	461	Beaufort wind scale	A numerical scale for indicating wind speed, devised by Admiral Sir Francis Beaufort in 1805. Beaufort numbers (or forces) range from force ... more A numerical scale for indicating wind speed, devised by Admiral Sir Francis Beaufort in 1805. Beaufort numbers (or forces) range from force 0 (calm) to force 12 (hurricane).
	462	bed	The GROUND upon which a body of water rests.
	463	bedrock	Any solid ROCK underlying SOIL or unconsolidated SEDIMENTS.
	464	bel	A dimensionless unit for expressing the ratio of two values of power, the number of bels being the logarithm to the base 10 of the power rat... more A dimensionless unit for expressing the ratio of two values of power, the number of bels being the logarithm to the base 10 of the power ratio. In practice decibel is commonly used, the number of decibels being 10 times the logarithm to the base 10 of the power ratio.
	465	bell buoy	See BUOY: SOUND.
	466	belt	In ice terminology, a long area of PACK ICE from a few kilometres to more than 100 kilometres in width.
	467	bench	See TERRACE.
	468	bench mark (benchmarks)	A permanent, stable object containing a marked point of known ELEVATION with respect to a DATUM used as a REFERENCE LEVEL for TIDAL OBSERVAT... more A permanent, stable object containing a marked point of known ELEVATION with respect to a DATUM used as a REFERENCE LEVEL for TIDAL OBSERVATIONS or as a control point for LEVELLING.
	469	beneaped (or neaped)	Said of a vessel left aground following a spring high tide.
	470	benthic division	In the classification of the marine ENVIRONMENT and its inhabitants, a primary division of the SEA which includes all of the ocean floor. Th... more In the classification of the marine ENVIRONMENT and its inhabitants, a primary division of the SEA which includes all of the ocean floor. The other primary division of the SEA is the PELAGIC DIVISION.
	471	benthos	The category of marine organisms that live on, in, or close to the BOTTOM of the OCEANS.
	472	berg	Short for ICEBERG.
	473	bergy bit	A massive piece of SEA ICE or disrupted HUMMOCKED ICE; also medium-sized piece of floating GLACIER ICE. Generally less than 5 m above SEA LE... more A massive piece of SEA ICE or disrupted HUMMOCKED ICE; also medium-sized piece of floating GLACIER ICE. Generally less than 5 m above SEA LEVEL, and not more than about 10 m across.
	474	berm	A narrow, raised path or EMBANKMENT along a STREAM, CANAL, or BEACH. On a BEACH it may be formed by the deposit of material by WAVES and mar... more A narrow, raised path or EMBANKMENT along a STREAM, CANAL, or BEACH. On a BEACH it may be formed by the deposit of material by WAVES and marks the limit of HIGH TIDES.
	475	berm line	In CARTOGRAPHY, the outer edge of vegetation shown as SHORELINE on CHARTS in marsh or mangrove areas.
	476	berth	A place, generally named or numbered, where a vessel may MOOR or anchor.
	477	beset	(adj.). Of a ship when surrounded so closely by SEA ICE that steering control is lost. The term does not imply pressure. See also ICEBOUND, ... more (adj.). Of a ship when surrounded so closely by SEA ICE that steering control is lost. The term does not imply pressure. See also ICEBOUND, NIPPED.
	478	Bessel's spheroid	See REFERENCE SPHEROID.
	479	between-the-lens shutter	See SHUTTER.
	480	bias	The distortion of a result through negligence of a factor usually introducing a systematic error of unchanging magnitude and sign throughout... more The distortion of a result through negligence of a factor usually introducing a systematic error of unchanging magnitude and sign throughout a given series of observations.
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