15-letter words containing h, e, r, m, a
- jerusalem thorn — See under Christ's-thorn.
- karaoke machine — a device that plays a prerecorded backing tape, to which people take it in turns to sing
- katathermometer — a thermometer used to measure the cooling power of ambient air
- keratoacanthoma — (pathology) A common low-grade malignancy of the skin.
- knapping hammer — a hammer used for breaking and shaping stones
- largemouth bass — a North American freshwater game fish, Micropterus salmoides, having an upper jaw extending behind the eye and a broad, dark, irregular stripe along each side of the body. Compare smallmouth bass.
- laser chemistry — the use of a laser to initiate and control chemical reactions.
- laser machining — Laser machining is a process in which material is removed from a surface using light from a laser.
- like grim death — as if afraid for one's life
- lithium battery — A lithium battery is a type of battery used for low-power, high-reliability, long-life applications, such as clocks, cameras and calculators.
- lithium citrate — a white crystalline solid sometimes used in the treatment of manic-depressive illness and mania. Formula: Li3C6H5O7
- macaroni cheese — Macaroni cheese is a dish made from macaroni and cheese sauce.
- machinery steel — low-carbon steel that can be easily machined.
- mad as a hatter — mentally disturbed; deranged; insane; demented.
- magnetorheology — the study of the relationships between the particle and fluid properties of magnetic suspensions.
- maidenhair fern — any fern of the cosmopolitan genus Adiantum, esp A. capillis-veneris, having delicate fan-shaped fronds with small pale-green leaflets: family Adiantaceae
- maidenhair tree — ginkgo.
- maidenhair-tree — ginkgo.
- maidenhair-vine — wire vine.
- make a horlicks — to make a mistake or a mess
- make it hot for — having or giving off heat; having a high temperature: a hot fire; hot coffee.
- make the effort — try
- make the rounds — having a flat, circular surface, as a disk.
- man of the hour — a man who is honored by a group.
- manasseh cutler — Manasseh, 1742–1823, U.S. Congregational clergyman and scientist: promoted settlement of Ohio; congressman 1801–05.
- mannerheim line — a zone of Finnish fortification erected along part of the border between Finland and Russia before the Finno-Russian War.
- manx shearwater — a European oceanic bird, Puffinus puffinus, with long slender wings and black-and-white plumage: family Procellariidae (shearwaters)
- marathon runner — person who runs in a marathon race
- marching orders — military orders, esp to infantry, giving instructions about a march, its destination, etc
- mare erythraeum — (Red Sea) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth.
- marital therapy — a psychotherapeutic treatment for married couples, who are seen by a therapist both individually and jointly to assist them in resolving various problems related to their marriage.
- market research — investigation into consumers' needs
- market-research — to conduct market research on.
- marlborough leg — a tapered leg having a square section.
- marsh andromeda — a low-growing pink-flowered ericaceous evergreen shrub, Andromeda polifolia, that grows in peaty bogs of northern regions
- masculine rhyme — a rhyme of but a single stressed syllable, as in disdain, complain.
- master mechanic — a mechanic, especially one who is thoroughly skilled, in charge of other mechanics.
- matta echaurren — Roberto Antonio Sebastián [raw-ver-taw ahn-taw-nyaw se-vahs-tyahn] /rɔˈvɛr tɔ ɑnˈtɔ nyɔ ˌsɛ vɑsˈtyɑn/ (Show IPA), 1911–2002, Chilean painter.
- meadow mushroom — any of various fleshy fungi including the toadstools, puffballs, coral fungi, morels, etc.
- measuring chain — a flexible length of metal links used in calculating distances
- mechanomorphism — the doctrine that the universe is fully explicable in mechanistic terms.
- mechanoreceptor — any of the sense organs that respond to vibration, stretching, pressure, or other mechanical stimuli.
- mechlorethamine — a nitrogen mustard, C 5 H 1 1 Cl 2 N, used in combination with other drugs in the treatment of Hodgkin's disease and certain other cancers.
- medical history — the past background of a person in terms of health
- medieval hebrew — the Hebrew language as used from the 6th to the 13th centuries a.d.
- membership pack — a collection of documents, information leaflets, cards, etc, that is given to members, especially new ones
- merchant banker — A merchant banker is someone who works for a merchant bank.
- merchant marine — the vessels of a nation that are engaged in commerce.
- merchant prince — a very wealthy or influential merchant.
- merchant seaman — a seaman who works on a merchant vessel.