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13-letter words containing a, e, c, h, m

  • lower chamber — lower house.
  • lucifer match — friction match.
  • luncheon meat — any of various sausages or molded loaf meats, usually sliced and served cold, as in sandwiches or as garnishes for salads.
  • maccheroncini — thin pasta tubes made from wheat flour
  • machiavellian — of, like, or befitting Machiavelli.
  • machiavellism — of, like, or befitting Machiavelli.
  • machine cycle — (processor)   The four steps which the CPU carries out for each machine language instruction: fetch, decode, execute, and store. These steps are performed by the control unit, and may be fixed in the logic of the CPU or may be programmed as microcode which is itself usually fixed (in ROM) but may be (partially) modifiable (stored in RAM). The fetch cycle places the current program counter contents (the address of the next instruction to execute) on the address bus and reads in the word at that location into the instruction register (IR). In RISC CPUs instructions are usually a single word but in other architectures an instruction may be several words long, necessitating several fetches. The decode cycle uses the contents of the IR to determine which gates should be opened between the CPU's various functional units and busses and what operation the ALU(s) should perform (e.g. add, bitwise and). Each gate allows data to flow from one unit to another (e.g. from register 0 to ALU input 1) or enables data from one output onto a certain bus. In the simplest case ("horizontal encoding") each bit of the instruction register controls a single gate or several bits may control the ALU operation. This is rarely used because it requires long instruction words (such an architecture is sometimes called a very long instruction word architecture). Commonly, groups of bits from the IR are fed through decoders to control higher level aspects of the CPU's operation, e.g. source and destination registers, addressing mode and ALU operation. This is known as vertical encoding. One way RISC processors gain their advantage in speed is by having simple instruction decoding which can be performed quickly. The execute cycle occurs when the decoding logic has settled and entails the passing of values between the various function units and busses and the operation of the ALU. A simple instruction will require only a single execute cycle whereas a complex instruction (e.g. subroutine call or one using memory indirect addressing) may require three or four. Instructions in a RISC typically (but not invariably) take only a single cycle. The store cycle is when the result of the instruction is written to its destination, either a register or a memory location. This is really part of the execute cycle because some instructions may write to multiple destinations as part of their execution.
  • machine error — an error caused by a fault or defect in a machine rather than by human error
  • machine screw — a threaded fastener, either used with a nut or driven into a tapped hole, usually having a diameter of about 1/4 inch (6.4 mm) or less and a slotted head for tightening by a screwdriver.
  • machine-steel — low-carbon steel that can be easily machined.
  • machinegunned — Simple past tense and past participle of machinegun.
  • macrencephaly — The presence of an abnormally large brain.
  • macrocephalic — Cephalometry. being or having a head with a large cranial capacity.
  • macrocephalus — Alternative spelling of macrocephalous.
  • macrolecithal — megalecithal.
  • magma chamber — a reservoir of magma in the earth's crust where the magma may reside temporarily on its way from the upper mantle to the earth's surface
  • magnet school — a public school with special programs and instruction that are not available elsewhere in a school district and that are specially designed to draw students from throughout a district, especially to aid in desegregation.
  • magnetic head — head (def 33).
  • maiden speech — the first speech made in a legislature by a newly elected member.
  • make mischief — cause trouble
  • mango chutney — chutney which contains or is made from the fruit mango
  • manhole cover — a removable metal plate covering a shaft that leads down to a sewer or drain
  • marchionesses — Plural form of marchioness.
  • mare chronium — an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth.
  • massachusetts — a state in the NE United States, on the Atlantic coast. 8257 sq. mi. (21,385 sq. km). Capital: Boston. Abbreviation: MA (for use with zip code), Mass.
  • master switch — a switch that can be used to turn on or off the supply of electricity to a building or to certain equipment
  • match fitness — the condition of being match-fit
  • matched order — an order placed with a broker to buy a specified stock at a price above the market price with the intention of immediately selling the stock through another broker at the same price. It is designed to give the appearance of active trading in the stock.
  • matchlessness — The state or condition of being matchless.
  • mathematician — an expert or specialist in mathematics.
  • mathematicism — the belief that everything can be explained in mathematical terms
  • mechanisation — Alternative spelling of mechanization.
  • mechanization — to make mechanical.
  • megalocephaly — Cephalometry, Craniometry. macrocephalic.
  • melancholious — (obsolete) melancholy.
  • melanochroous — having dark-coloured or black skin
  • merchandisers — Plural form of merchandiser.
  • merchandising — the manufactured goods bought and sold in any business.
  • merchandizing — Alternative spelling of merchandising.
  • merchant bank — a private banking firm engaged chiefly in investing in new issues of securities and in accepting bills of exchange in foreign trade.
  • merchant fees — Merchant fees are money charged by a merchant service to a vendor for processing credit card transactions.
  • merchant flag — the ensign used by all ships engaged in commerce, fishing, etc.
  • merchant navy — commercial ships
  • merchant ship — law: commercial vessel
  • mesaticephaly — the state or condition of being mesaticephalic or mesocephalic
  • mesencephalic — Anatomy. the midbrain.
  • mesencephalon — Anatomy. the midbrain.
  • mesocephalism — mesocephaly
  • mesocephalous — Alternative form of mesocephalic.
  • metachromasia — A characteristic change in the colour of staining carried out in biological tissues, exhibited by certain aniline dyes when they bind to particular substances present in these tissues, called chromotropes.
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