magnetic resonance imaging MRI | the use of nuclear magnetic resonance of protons to produce proton density images |
functional magnetic resonance imaging fMRI | a form of magnetic resonance imaging of the brain that registers blood flow to functioning areas of the brain |
blood-oxygenation level dependent functional magnetic resonance imaging BOLD FMRI | functional magnetic resonance imaging that relies on intrinsic changes in hemoglobin oxygenation |
magnetic levitation maglev | high-speed rail technology, train is suspended on a magnetic cushion above a magnetized track and so travels free of friction |
acetate disk phonograph recording disk | a disk coated with cellulose acetate |
brake disk | a disk or plate that is fixed to the wheel, pressure is applied to it by the brake pads |
compact disk compact disc CD | a digitally encoded recording on an optical disk that is smaller than a phonograph record, played back by a laser |
compact-disk burner CD burner | recording equipment for making compact disks |
core magnetic core | (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data, now superseded by semiconductor memories, each core has three wires passing through it, providing the means to select and detect the contents of each bit |
disk disc | a flat circular plate |
disk access | memory access to the computer disk on which information is stored |
disk brake disc brake | hydraulic brake in which friction is applied to both sides of a spinning disk by the brake pads |
disk cache | a cache that stores copies of frequently used disk sectors in random access memory (RAM) so they can be read without accessing the slower disk |
disk clutch | a friction clutch in which the frictional surfaces are disks |
disk controller | (computer science) a circuit or chip that translates commands into a form that can control a hard disk drive |
disk drive disc drive hard drive Winchester drive | computer hardware that holds and spins a magnetic or optical disk and reads and writes information on it |
diskette floppy floppy disk | a small plastic magnetic disk enclosed in a stiff envelope with a radial slit, used to store data or programs for a microcomputer, floppy disks are noted for their relatively slow speed and small capacity and low price |
disk harrow disc harrow | a harrow with a series of disks set on edge at an angle |
hard disc hard disk fixed disk | a rigid magnetic disk mounted permanently in a drive unit |
magnetic bottle | container consisting of any configuration of magnetic fields used to contain a plasma during controlled thermonuclear reactions |
magnetic bubble memory | a nonvolatile storage device that holds information in the form of bubbles on a thin film of magnetic silicate, no longer used in most computers |
magnetic compass | compass based on an indicator (as a magnetic needle) that points to the magnetic north |
magnetic core memory core memory | (computer science) a computer memory consisting of an array of magnetic cores, now superseded by semiconductor memories |
magnetic disk magnetic disc disk disc | (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored |
magnetic head | an electromagnet (as on a tape recorder) that converts electrical variations into magnetic variations that can be stored on a surface and later retrieved |
magnetic mine | (nautical) a marine mine that is detonated by a mechanism that responds to magnetic material (as the steel hull of a ship) |
magnetic needle | a slender magnet suspended in a magnetic compass on a mounting with little friction, used to indicate the direction of the earth's magnetic pole |
magnetic recorder | recorder consisting of equipment for making records on magnetic media |
magnetic stripe | a short strip of magnetic tape attached to a credit card or debit card, it contains data that will tell a reading device who you are and what your account number is, etc. |
magnetic tape mag tape tape | memory device consisting of a long thin plastic strip coated with iron oxide, used to record audio or video signals or to store computer information, he took along a dozen tapes to record the interview |
negative magnetic pole negative pole south-seeking pole | the pole of a magnet that points toward the south when the magnet is suspended freely |
optical disk optical disc | a disk coated with plastic that can store digital data as tiny pits etched in the surface, is read with a laser that scans the surface |
phonograph record phonograph recording record disk disc platter | sound recording consisting of a disk with a continuous groove, used to reproduce music by rotating while a phonograph needle tracks in the groove |
pole magnetic pole | one of the two ends of a magnet where the magnetism seems to be concentrated |
positive pole positive magnetic pole north-seeking pole | the pole of a magnet that points toward the north when the magnet is suspended freely |
RAM disk | (computer science) a virtual drive that is created by setting aside part of the random-access memory to use as if it were a group of sectors, access to a RAM disk is very fast but the data it contains is lost when the system is turned off |
Rayleigh disk | an acoustic radiometer consisting of a light disk suspended from a quartz thread, when exposed to a progressive sound wave its torque can measure velocity |
removable disk | a hard disk that can be removed from the disk drive, removal prevents unauthorized use |
circularity disk shape | the roundness of a -dimensional figure |
magnetic field strength magnetic intensity magnetic induction magnetic flux density | the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow |
intervertebral disc intervertebral disk | a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two) |
blind spot optic disc optic disk | the point where the optic nerve enters the retina, not sensitive to light |
magnetic storage medium magnetic medium magnetic storage | any storage medium in which different patterns of magnetization are used to represent stored bits or bytes of information, the hard disk in you computer is magnetic storage |
disk file | (computer science) a computer file stored on a magnetic disk and identified by a unique label |
DOS disk operating system | an operating system that is on a disk |
MS-DOS Microsoft disk operating system | an operating system developed by Bill Gates for personal computers |
disk error | error resulting from malfunction of a magnetic disk |
magnetic storm | a sudden disturbance of the earth's magnetic field, caused by emission of particles from the sun |
disk pack disc pack | (computer science) a portable pack of magnetic disks used in a disk storage device |
aclinic line magnetic equator | an imaginary line paralleling the equator where a magnetic needle has no dip |