18-letter words containing a, e, g, n
- greater periwinkle — a Eurasian apocynaceous evergreen plant of the genus Vinca, V. major, having trailing stems and blue flowers
- greater roadrunner — either of two large terrestrial cuckoos of the genus Geococcyx of arid regions of the western U.S., Mexico, and Central America, especially G. californianus (greater roadrunner)
- green-backed heron — a small, American heron, Butorides striatus, having glossy green wings.
- greenhouse warming — the increase in the mean temperature of the earth attributed to the greenhouse effect
- gregorian calendar — the reformed Julian calendar now in use, according to which the ordinary year consists of 365 days, and a leap year of 366 days occurs in every year whose number is exactly divisible by 4 except centenary years whose numbers are not exactly divisible by 400, as 1700, 1800, and 1900.
- grosse pointe park — a city in SE Michigan, near Detroit.
- growing degree-day — a degree-day above 41°F (5°C), used in relation to plant growth.
- grumbling appendix — a condition in which the appendix causes intermittent pain but appendicitis has not developed
- guidance counselor — advisor in schools
- gulf saint vincent — a shallow inlet of SE South Australia, to the east of the Yorke Peninsula: salt industry
- gyromagnetic ratio — the ratio of the magnetic moment of a rotating charged particle to its angular momentum.
- hardy-weinberg law — a principle stating that in an infinitely large, randomly mating population in which selection, migration, and mutation do not occur, the frequencies of alleles and genotypes do not change from generation to generation.
- hash house slinger — a person who serves in a cheap cafe
- haulage contractor — a person or firm that transports goods by lorry
- have a thing about — If you have a thing about someone or something, you have very strong feelings about them.
- hearing impairment — partial deafness
- heart-lung machine — a device through which blood is shunted temporarily for oxygenation during surgery, while the heart or a lung is being repaired.
- heating degree-day — a degree-day below the standard temperature of 65°F or 19°C, used in estimating fuel consumption.
- hedge fund manager — a person in charge of managing a hedge fund and making its investments
- hegelian dialectic — an interpretive method, originally used to relate specific entities or events to the absolute idea, in which some assertible proposition (thesis) is necessarily opposed by an equally assertible and apparently contradictory proposition (antithesis) the mutual contradiction being reconciled on a higher level of truth by a third proposition (synthesis)
- hepatosplenomegaly — Enlargement of both the liver and spleen.
- herring bone weave — a pattern consisting of adjoining vertical rows of slanting lines, any two contiguous lines forming either a V or an inverted V , used in masonry, textiles, embroidery, etc.
- high-grade mineral — a mineral fulfilling certain conditions as regards purity or other physical properties
- highbush cranberry — a shrub, Viburnum trilobum, of northern North America, having broad clusters of white flowers and edible scarlet berries.
- highlight halftone — dropout (def 7).
- hungry programmers — (body) A group of programmers producing free software.
- identification tag — either of two oblong metal tags, issued to armed forces personnel, on which are impressed the serial number, name, etc., of the person to whom it is issued, and carried on or about the person at all times.
- imaginary operator — An imaginary operator is the part of a complex number that defines the magnitude of the part of the complex number at right angles to the real number part.
- 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.
- impingement attack — a form of corrosion of metals caused by erosion of the oxide layer by a moving fluid in which there are suspended particles or air bubbles
- in (the) aggregate — If a number of different things or amounts are considered in aggregate, or in the aggregate, they are considered as a single thing or amount.
- in good/bad repair — If something such as a building is in good repair, it is in good condition. If it is in bad repair, it is in bad condition.
- incidental charges — Incidental charges are costs of items and services that are not part of the main bill.
- incidental damages — law: incurred by contract breach
- inclusive language — language that avoids the use of certain expressions or words that might be considered to exclude particular groups of people, esp gender-specific words, such as "man", "mankind", and masculine pronouns, the use of which might be considered to exclude women
- industrial hygiene — the science that assesses, controls, and prevents occupational factors or sources of stress in the workplace that may significantly affect the health and well-being of employees or of the community in general
- inquisitor-general — the head of the Spanish court of Inquisition
- instrument landing — an aircraft landing accomplished by use of gauges on the instrument panel and ground-based radio equipment, with limited reference to outside visual signals.
- integrated circuit — a circuit of transistors, resistors, and capacitors constructed on a single semiconductor wafer or chip, in which the components are interconnected to perform a given function. Abbreviation: IC.
- integrated studies — a course that includes a number of subjects and is organized by theme
- integrating factor — a factor that upon multiplying a differential equation with the right-hand side equal to zero makes the equation integrable, usually by making the resulting expression an exact differential of some function.
- intelligence agent — a person who works for an intelligence agency; a spy
- intercartilaginous — (anatomy) Within cartilage.
- interchangeability — (of two things) capable of being put or used in the place of each other: interchangeable symbols.
- interlacing arcade — an arcade, especially a blind one, composed of arches (interlacing arches) so arranged and cut that each arch seems to intersect and be intersected by one or more other arches.
- internationalizing — Present participle of internationalize.
- interrogation mark — Also called interrogation point, interrogation mark. a mark indicating a question: usually, as in English, the mark (?) placed after a question.
- intimate borrowing — the borrowing of linguistic forms by one language or dialect from another when both occupy a single geographical or cultural community.
- investment casting — a casting process in which an expendable pattern is surrounded by an investment compound and then baked so that the investment is hardened to form a mold and the pattern material may be melted and run off.
- investment manager — financial advisor