heavy rail
nounRail equipment
A term generally applied to main-line railways, but this varies from country to country. It has no relation to the weight of the rails used.
Entries starting with H
315 entries.
heavy vehicle
nounAutomotive
A vehicle designed to carry large loads or a high number of passengers beyond an officially set weight or number, such as a semitrailer, bus or coach, vehicle carrier, livestock transport, road train, etc.
heck
An apparatus for separating the threads of warps into sets, as they are wound upon the reel from the bobbins, in a warping machine.
heck-box
A grating device used to separate and guide the threads in a warping machine.
heckle
verbManufacturing
To prepare (flax) for spinning, using special combs called hackles.
hectoamp
An SI unit of electrical current equal to 10² amps. Symbol: h
hectoampere
An SI unit of electrical current equal to 10² amperes. Symbol: hA
hectobecquerel
An SI unit of radiation equal to 10² becquerels. Symbol: h
hectogram
An SI unit of mass equal to 10² grams. Symbol: hg
hectokatal
An SI unit of catalytic activity equal to 10² katals. Symbol: h
hectometre
An SI unit of length equal to 100 metres. Symbol: hm
hectopascal
An SI unit of pressure equal to 10² pascals. Symbol: hPa
Hedebo
nounManufacturing
Any of various forms of whitework embroidery that originated in the heathland region of Zealand, Denmark, in the 1760s.
hedera
Any Old World ivy of the genus Hedera
heel
nounCarpentry
The short side of an angled cut.
heel-and-toe
nounAutomotive
An advanced driving technique that involves operating the throttle and brake pedals simultaneously with the right foot, facilitating normal activation of the clutch with the left foot.
heelpost
nounCarpentry
The post to which a gate or door is hinged.
heft
A part of a serial publication; a fascicle, an issue, a number.
height to paper
In typefounding, the length of a type from its face to its foot.
heirloom
An old crop variety that has been passed down through generations of farmers by seed saving and cultivation, in contrast to modern cultivars used in large-scale agriculture.
helicopter ear
A form of Helmholtz resonance experienced in a moving vehicle, when one of the windows is rolled down.
helioelectricity
A form of electric power that is generated or harnessed by the rays of the sun.
helitorch
An ignition device operated from a helicopter, used to start controlled fires etc.
hellbox
A receptacle where cast metal sorts were thrown after printing.
hello girl
A female telephone operator.
helmet
A hard, protective head covering, typically part of armour.
helper
nounRail equipment
A locomotive that assists a train, usually on steep gradients.
helper grade
nounRail equipment
A railroad gradient where helper locomotives are required to assist the train locomotives.
helper-up
A boy employed to assist the barrowman out of a dip place.
helping hand
A jig used to help solder wires and electronics, consisting of a weighted base, a pair of adjustable arms ending in crocodile clips (the hands), and sometimes a magnifying glass, held together by flexible joints.
helpline
A telephone service (or (by extension) one using email, SMS, or the Web) which offers help to those who call, as either a public emergency service or customer service.
hem
nounManufacturing
The border of an article of clothing doubled back and stitched together to finish the edge and prevent it from fraying.
hemi
nounAutomotive
A vehicle equipped with such a motor engine.
Henley
nounManufacturing
Alternative letter-case form of henley.
HEO
Initialism of highly elliptical orbit.
heritage railway
nounRail equipment
A railway operating a line with preserved and restored locomotives, trains and infrastructure, and usually providing train services for visitors; in effect a working open-air museum.
herringbone
nounManufacturing
Twilled fabric woven in rows of parallel sloping lines.
heterojunction
Any junction between two different semiconductors; functions as a diode
HF
Initialism of high frequency.
HFR
Initialism of high-frequency rail
HGV
nounAutomotive
Initialism of heavy goods vehicle (“a lorry/truck weighing more than 3.5 tons”).
HHG
Initialism of household goods.
hibernation
A hypothetical state of minimum power consumption, inactivity and metabolic depression in humans during long space flights.
hickey
A serif or other ornamentation on type.
HID
adjectiveAutomotive
Initialism of high-intensity discharge.
HIF
Initialism of higher intermediate fare.
high
adjectiveMarine and shipyard
Near, in its direction of travel, to the (direction of the) wind.
high shelf
A filter that gradually increases or decreases frequencies above a certain point in the frequency spectrum.
high speed steel
nounMetallurgy
A kind of tool steel, invented in the early 20th century, which retains its hardness and temper at high temperatures (at which previous kinds of tool steel would soften), thus allowing cutters made from it to be employed at higher cutting speeds than were previously practical.
high-entropy alloy
nounMetallurgy
a type of metallic alloy containing not one dominant element, but multiple major elements, with a single crystalline structure and existing in a single phase
high-level synthesis
A design method that automatically transforms an algorithmic or behavioral description of a digital system, written in a high-level language such as C or C++, into a register-transfer level hardware description suitable for FPGA or ASIC implementation.
high-occupancy vehicle lane
nounAutomotive
A restricted traffic lane reserved for the exclusive use of vehicles with a driver and at least one passenger, including carpools, vanpools, and transit buses.
high-octane
adjectiveAutomotive
Of fuel, having a high octane number, good antiknock characteristics; used in high-performance vehicles.
high-powered
adjectiveOptics and imaging
Of an instrument, capable of great magnification.
high-speed rail
nounRail equipment
A type of rail transport that operates significantly faster than traditional rail traffic, using an integrated system of specialized rolling stock and dedicated tracks.
high-time
adjectiveMechanical engineering
Having been in use for a (relatively) long time or a large number of operating cycles; nearing retirement or replacement age.
high-visibility
adjectiveManufacturing
Made of a reflective or fluorescent material that can be easily seen.
highball
nounRail equipment
An all clear or full speed ahead signal.
higher-speed rail
nounRail equipment
A type of railway system based on existing infrastructure upgraded to allow passenger train speeds typically between 80 and 120 miles per hour.
highpass
adjectiveIndustrial electronics
Describing a filter, circuit, or system that rejects or attenuates a frequencies below a specified value while passing those above.