18-letter words containing m, a, h

impedance matching — the technique of choosing or adjusting electric circuits and components so that the impedance of the load is equal to the internal impedance of the power source, thereby optimizing the power transfer from source to load.
in abraham's bosom — at rest with one's dead ancestors
in company with sb — If you feel, believe, or know something in company with someone else, you both feel, believe, or know it.
in comparison with — when compared to
in compliance with — in accordance with
in the affirmative — positively, by saying yes
in the name of sth — If you do something in the name of an ideal or an abstract thing, you do it in order to preserve or promote that thing.
in the same breath — the air inhaled and exhaled in respiration.
information theory — the mathematical theory concerned with the content, transmission, storage, and retrieval of information, usually in the form of messages or data, and especially by means of computers.
inner automorphism — an automorphism that maps an element x into an element of the form axa −1 where a −1 is the inverse of a.
ionization chamber — a device for detecting and measuring ionizing radiation, consisting of a tube containing a low pressure gas and two electrodes between which a high voltage is maintained. The current between the electrodes is a function of the intensity of the radiation
isothermal process — a process that takes place without change in temperature.
james-lange theory — a theory that emotions are caused by bodily sensations; for example, we are sad because we weep
johnny-come-lately — a late arrival or participant; newcomer: the Johnny-come-latelies producing space-war films after the trend had ended.
king-of-the-salmon — a ribbonfish, Trachypterus altivelis, of northern parts of the Pacific Ocean.
kitchen-sink drama — a type of drama of the 1950s depicting the sordid aspects of domestic reality
lactogenic hormone — prolactin.
lagrange's theorem — the theorem that the order of each subgroup of a finite group is a factor of the order of the group.
lambeth conference — a convention of the bishops of the Anglican communion, held about every 10 years at Lambeth Palace to confer but not to define doctrine or to legislate on ecclesiastical matters.
launching ceremony — a ceremony that celebrates the launch of a ship for the first time into the water
light displacement — the weight of a ship with all its permanent equipment, excluding the weight of cargo, persons, ballast, dunnage, and fuel, but usually including the weight of permanent ballast and water used to operate steam machinery.
lighting cameraman — the person who designs and supervises the lighting of scenes to be filmed
literae humaniores — (at Oxford University) the faculty concerned with Greek and Latin literature, ancient history, and philosophy; classics
logarithmic spiral — log r = aθ
logarithmus dualis — (mathematics) (ld) Latin for logarithm base two. More commonly written as "log" with a subscript "2". Roughly the number of bits required to represent an integer.
lower klamath lake — See under Klamath Lakes.
magic switch story — Some years ago, I was snooping around in the cabinets that housed the MIT AI Lab's PDP-10, and noticed a little switch glued to the frame of one cabinet. It was obviously a homebrew job, added by one of the lab's hardware hackers (no-one knows who). You don't touch an unknown switch on a computer without knowing what it does, because you might crash the computer. The switch was labelled in a most unhelpful way. It had two positions, and scrawled in pencil on the metal switch body were the words "magic" and "more magic". The switch was in the "more magic" position. I called another hacker over to look at it. He had never seen the switch before either. Closer examination revealed that the switch had only one wire running to it! The other end of the wire did disappear into the maze of wires inside the computer, but it's a basic fact of electricity that a switch can't do anything unless there are two wires connected to it. This switch had a wire connected on one side and no wire on its other side. It was clear that this switch was someone's idea of a silly joke. Convinced by our reasoning that the switch was inoperative, we flipped it. The computer instantly crashed. Imagine our utter astonishment. We wrote it off as coincidence, but nevertheless restored the switch to the "more magic" position before reviving the computer. A year later, I told this story to yet another hacker, David Moon as I recall. He clearly doubted my sanity, or suspected me of a supernatural belief in the power of this switch, or perhaps thought I was fooling him with a bogus saga. To prove it to him, I showed him the very switch, still glued to the cabinet frame with only one wire connected to it, still in the "more magic" position. We scrutinized the switch and its lone connection, and found that the other end of the wire, though connected to the computer wiring, was connected to a ground pin. That clearly made the switch doubly useless: not only was it electrically nonoperative, but it was connected to a place that couldn't affect anything anyway. So we flipped the switch. The computer promptly crashed. This time we ran for Richard Greenblatt, a long-time MIT hacker, who was close at hand. He had never noticed the switch before, either. He inspected it, concluded it was useless, got some diagonal cutters and diked it out. We then revived the computer and it has run fine ever since. We still don't know how the switch crashed the machine. There is a theory that some circuit near the ground pin was marginal, and flipping the switch changed the electrical capacitance enough to upset the circuit as millionth-of-a-second pulses went through it. But we'll never know for sure; all we can really say is that the switch was magic. I still have that switch in my basement. Maybe I'm silly, but I usually keep it set on "more magic".
magnetorheological — (physics) describing a substance whose rheological properties are modified by a magnetic field.
make a meal of sth — If you think someone is taking more time and energy to do something than is necessary, you can say that they are making a meal of it.
make a night of it — to cause an activity to last a night
make heavy weather — to bring into existence by shaping or changing material, combining parts, etc.: to make a dress; to make a channel; to make a work of art.
make short work of — exertion or effort directed to produce or accomplish something; labor; toil.
make sth one's own — If you make something your own, you become involved in it in such a way that people think of it as being related only to you or belonging only to you, rather than to anyone else.
malicious mischief — willful destruction of personal property motivated by ill will or resentment toward its owner or possessor.
malpighian tubules — one of a group of long, slender excretory tubules at the anterior end of the hindgut in insects and other terrestrial arthropods.
manchester terrier — one of a breed of slender terriers having a short, glossy, black-and-tan coat, raised originally in Manchester, England.
manhattan district — (during World War II) the code name for a unit of US army engineers established in 1942 to construct secret sites for the development of the atomic bomb
many happy returns — When it is someone's birthday, people sometimes say 'Many happy returns' to them as a way of greeting them.
marine archaeology — the branch of archaeology that deals with the recovery of ancient objects found beneath the sea, as shipwrecks or remains from submerged islands, and with the techniques of underwater exploration, excavation, and retrieval.
marketing research — the study of influences upon customer and consumer behaviour and the analysis of market characteristics and trends
materials handling — the loading, unloading, and movement of goods, as within a factory or warehouse, especially by the aid of mechanical devices.
maternity hospital — birthing facility
mathematical error — a mistake in a mathematical calculation, etc
mathematical logic — symbolic logic.
mathematical model — a representation of a system, process, etc, in mathematical terms
matthias schleiden — Matthias Jakob [mah-tee-ahs yah-kawp] /mɑˈti ɑs ˈyɑ kɔp/ (Show IPA), 1804–81, German botanist.
maximum likelihood — greatest probability
mechanical drawing — drawing, as of machinery, done with the aid of rulers, scales, compasses, etc.
mechanical testing — Mechanical testing is the testing of a material to find out its mechanical properties, for example its yield strength or hardness.
median lethal dose — the quantity of a lethal substance, as a poison or pathogen, or of ionizing radiation that will kill 50 percent of the organisms subjected to it in a specified time period. Symbol: LD 5 0.

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