18WuD2x

448 midrange speaker • milliroentgen
audio spectrum. Such a speaker is intermediate
in performance between a WOOFER and a
TWEETER.
midsection The center section of a multisection filter
having an odd number of sections; thus, the
second section of a three-section filter.
migration See ION MIGRATION.
mike 1. See MICROPHONE. 2. See MICROFARAD.
3. See MICROMETER.
MIL Abbreviation of military.
mil 1. A small unit of linear measure; 1 mil = 10 –3
(0.001) inch = 0.0254 mm. 2. Thousand, as in n
parts per mil.
mile Abbreviation, m or mi. A large unit of linear
measure, 1 mi = 1.609 km = 5280 feet.
military robot A robot designed and used for the
purpose of executing some task in warfare. The
two general types are: human-operated and
computer-controlled. An example of a humanoperated
military robot is an aircraft that is flown
by remote control by a ground-based pilot. The
same robot, or a whole fleet of them, might be
flown by a computer using sophisticated EXPERT
SYSTEMS.
mill A telegraph operator’s typewriter.
Miller oscillator A crystal oscillator circuit in
which the crystal is connected between the control
electrode and ground. The tuned tank is connected
in the output circuit. The internal
capacitance of the active device provides feedback
coupling. Sometimes called conventional crystal
oscillator.
milli- Abbreviation, m. A prefix meaning thousandth(s):
10 –3 (0.001).
Miller oscillator
+12 V
Output
milliammeter A usually direct-reading instrument
for measuring current in the milliampere range.
Also see CURRENT METER.
milliampere Abbreviation, mA. A unit of current
equal to 10 –3 (0.001) ampere.
milliampere-hour Abbreviation, mAh. A unit of
low current drain or charging rate, equal to 10 -3
(0.001) ampere-hour. Also see AMPERE-HOUR
and BATTERY CAPACITY.
millibar Abbreviation, mb. A unit of low pressure
equal to 10 –3 (0.001) bar or = 100 pascals.
millicurie Abbreviation, mCi. A small unit of radioactivity
equal to 3.71 × 10 7 disintegrations per
second, or 10 –3 (0.001) curie. Also see CURIE.
millifarad Abbreviation, mF. A seldom-used unit of
capacitance, equal to 10 –3 (0.001) farad or 1000
microfarads.
milligram Abbreviation, mg. A metric unit of
weight equal to 10 –3 (0.001) gram.
millihenry Abbreviation, mH. A unit of inductance,
equal to 10 –3 (0.001) henry.
millihorsepower Abbreviation, mhp. A unit of
power equal to 10 –3 (0.001) horsepower or 0.746
watt. Also see HORSEPOWER.
millilambert Abbreviation, mL. A small unit of
brightness equal to 10 –3 (0.001) lambert.
milliliter Abbreviation, ml. A metric unit of volume
equal to 10 –3 (0.001) liter.
millimaxwell Abbreviation, mMx. A small unit of
magnetic flux equal to 10 –3 (0.001) maxwell or
10 –11 weber.
millimeter Abbreviation, mm. A metric unit of linear
measure equal to 10 –3 (0.001) meter or
0.03937 inch.
millimeter equivalent The number of millimeters
equal to a given English measure fraction (e.g.,
the millimeter equivalent of 5 ⁄16 inch is 7.937).
millimeter waves Wavelengths between 0.6 and
10 mm (frequencies from 30 to 500 GHz).
millimicro See NANO-.
millimicrofarad See NANOFARAD.
millimicrohenry See NANOHENRY.
millimicron Abbreviation, mm. A unit of wavelength
equal to 10 –3 micron or one nanometer (10 –9 meter).
millimilliampere See MICROAMPERE.
millimole Abbreviation, mmol. A unit in chemistry
equal to 10 –3 (0.001) mole.
milliohm A small unit of resistance, reactance, or
impedance, equal to 10 –3 (0.001) ohm.
milliohmmeter An ohmmeter for measuring resistances
in the milliohm range.
million electronvolt(s) See MEGAELECTRON-
VOLT.
milliphot A unit of illumination equal to 10 –3
(0.001) phot.
millipuffer See PUFFER.
milliradian Abbreviation, mrad. A unit of angular
measure equal to 10 –3 (0.001) radian.
milliroentgen Abbreviation, mr. A small unit of radioactive
dosage; 1 mr = 10 –3 (0.001) roentgen =
2.57976 × 10 –7 Ci/kg.