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	Eng ID	Term	Definition
	3201	medium frequency (MF)	See FREQUENCY: RADIO.
	3202	medusa	See COELENTERATE and JELLYFISH.
	3203	megacycle	One million CYCLES; one thousand KILOCYCLES. The term is often used incorrectly as the equivalent of one million CYCLES PER SECOND.
	3204	megahertz	One million HERTZ; one thousand KILOHERTZ. The term is used as the equivalent of one million CYCLES PER SECOND.
	3205	melting point	Temperature of change from the solid to the liquid phase of a substance. It is a function of pressure.
	3206	menu	A list of commands and/or options. The user selects the desired command by moving the CURSOR to the respective position on the menu or by en... more A list of commands and/or options. The user selects the desired command by moving the CURSOR to the respective position on the menu or by entering an appropriate code at the command entry line of the DISPLAY.
	3207	Mercator: transverse	See PROJECTION: TRANSVERSE MERCATOR.
	3208	Mercator chart	See CHART.
	3209	Mercator projection	See PROJECTION.
	3210	Mercator sailing	See SAILING.
	3211	mercurial (or mercury) barometer	See BAROMETER.
	3212	meridian	A north-south reference line, particularly a GREAT CIRCLE through the GEOGRAPHICAL POLES of the EARTH, from which LONGITUDES (or DEPARTURES)... more A north-south reference line, particularly a GREAT CIRCLE through the GEOGRAPHICAL POLES of the EARTH, from which LONGITUDES (or DEPARTURES) and AZIMUTHS are reckoned; or a plane normal to the GEOID or SPHEROID defining such a line. The term usually refers to the UPPER BRANCH.
	3213	meridian: astronomical	A line on the surface of the EARTH connecting points having the same ASTRONOMICAL LONGITUDE. Because the DEFLECTION OF THE VERTICAL is not t... more A line on the surface of the EARTH connecting points having the same ASTRONOMICAL LONGITUDE. Because the DEFLECTION OF THE VERTICAL is not the same at all points, an astronomical meridian is an irregular line, not lying in a single plane. Also called terrestrial meridian.
	3214	meridian: celestial	A GREAT CIRCLE of the CELESTIAL SPHERE through the CELESTIAL POLES and the ZENITH. The expression usually refers to the UPPER BRANCH.
	3215	meridian: central	See MERIDIAN: INITIAL.
	3216	meridian: compass	A line through the north-south points of a MAGNETIC COMPASS. The compass card axis lies in the compass meridian.
	3217	meridian: geodetic	A line on a SPHEROID which has the same GEODETIC LONGITUDE at every point.
	3218	meridian: geographic(al)	A general term, applying alike to an ASTRONOMICAL or a GEODETIC MERIDIAN.
	3219	meridian: Greenwich	The ASTRONOMICAL MERIDIAN through the centre of the TRANSIT instrument of the observatory of Greenwich, England, serving as the reference ... more The ASTRONOMICAL MERIDIAN through the centre of the TRANSIT instrument of the observatory of Greenwich, England, serving as the reference for GREENWICH TIME, in contrast with LOCAL MERIDIAN.
	3220	meridian: grid	One of the GRID lines extending in a grid north-south direction.
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