hot bed
A garden bed using such a heat-generating mass; a hotbox.
Entries starting with H
315 entries.
hot chassis
A metal chassis, used as a base for electrical equipment, that is live because it lacks a transformer to isolate the equipment from the mains.
hot end
The part of a glassworks comprising the forehearth, forming machines, and annealing ovens.
hot hatch
A high-performance hatchback small motor car.
hot metal
Printing type cast from molten metal; hot metal typesetting.
hot microphone
A microphone that is activated (but not powered) by the sound of the user's voice, allowing it to pick up speech without having to be manually turned on, while still rejecting background noise unaccompanied by speech.
hot patch
nounConstruction
A repair for cracks and potholes in a paved surface involving filling them with hot, molten asphalt concrete.
hot roll
verbMetalworking
To roll metal in a temperature that is above its recrystallization point.
hot rolling
nounMetallurgy
A rolling of metal at a temperature above that of its recrystallization point.
hot shift
nounAutomotive
An early mechanism that synchronized the speeds of gear wheels when changing gear in an automobile.
hot short
adjectiveMetallurgy
Of metal: brittle at high temperatures.
hot spot
A location which has a higher temperature or amount of radiation than surrounding areas.
hot stamp
nounMetallurgy
An impression made in a hot metal forging.
hot tear
nounMetallurgy
A fracture in a metal casting that occurs during solidification as a result of hindered contraction.
hot top
nounMetalworking
In casting, a live open riser with a hot ceramic liner, designed to counteract the formation of harmful hollows when casting objects of materials such as metals into molds.
hot work
nounMetallurgy
Any of several plastic deformations of metal (or other material) at relatively high temperatures.
hot zone
An area to which access is restricted because it is contaminated with radiation or a chemical or biological biohazard.
hotbox
nounRail equipment
An overheated axle box, bearing and bearing enclosure.
hotel load
The electrical load caused by all systems on a vehicle (especially a marine vessel or a truck) other than propulsion.
hound
Projections located at the masthead or foremast, serving as a support for the trestletrees and top on which to rest; a foretop.
hourly rating
nounRail equipment
A measure of the maximum output, usually expressed in horsepower, that can be obtained from the motors of an electric locomotive for a period of one hour without the motors overheating.
house
To stow in a safe place; to take down and make safe.
HOV
nounAutomotive
Initialism of high-occupancy vehicle.
hovercraft
A vehicle supported on a cushion of air, able to traverse many different types of terrain and travel over water, used for transport.
HPC
nounAutomotive
Initialism of high power charging.
HPP
nounAutomotive
Initialism of high performance powertrain
HRT
nounManufacturing
Initialism of half-rectangle triangle.
HS-DSCH
High Speed Downlink Shared Channel (in UMTS).
HS-PDSCH
Initialism of High Speed Physical Downlink Shared Channel (in UMTS).
HS-SCCH
Initialism of High Speed Shared Control Channel (in UMTS).
HS3
Initialism of Hurricane and Severe Storm Sentinel, a project launched in August 2012 to observe hurricanes.
HSCSD
Initialism of Highspeed Circuit Switched Data (2.5G).
HSDI
nounAutomotive
Initialism of high-speed (diesel) direct injection.
HSDPA
Initialism of High Speed Downlink Packet Access (in UMTS).
HSP
nounManufacturing
Initialism of highest shoulder point.
HST
nounManufacturing
Abbreviation of half-square triangle.
HSUPA
Initialism of High Speed Uplink Packet Access (in UMTS).
HSYNC
The horizontal synchronization signal incorporated in a video transmission, such as for a TV broadcast.
htr
nounManufacturing
Abbreviation of half treble crochet.
hub
nounSurveying
A stake with a nail in it, used to mark a temporary point.
hub-and-spoke
adjectiveTransport and logistics
Being or relating to a topology, whether for the physical distribution of goods or for telecommunications, that has a central "hub" connecting a number of outlying "spokes".
Hubble
A space telescope or spy satellite with a design like the Hubble Space Telescope.
hudge
A bucket for hoisting coal or ore.
Hudson
nounRail equipment
A steam locomotive of the 4-6-4 wheel arrangement.
hug-me-tight
A woman's short sleeveless close-fitting jacket, usually knitted or crocheted.
human interface device
Any hardware device allowing a user to interact with a computer, such as a keyboard or mouse.
hump
verbRail equipment
To shunt wagons / freight cars over the hump in a hump yard.
hump slug
nounRail equipment
A kind of slug (locomotive accessory) designed for even slower operation than a yard slug, and able to push a long cut of cars over a hump at very low speed.
hump yard
nounRail equipment
a classification yard or marshalling yard which has a hump over which trains are shunted, the vehicles then running on their own by gravity into various sidings.
hunting
The process of determining which of a group of telephone lines will receive a call.
hunting cog
A tooth in the larger of a pair gear wheels, which makes its number of teeth prime to the number in the smaller wheel, thus preventing the frequent meeting of the same pairs of teeth and reducing wear.
hurrier
A child employed in a coal mine to drag baskets or small wagons full of coal from the coal face where it was mined, up to the surface.
hurry
To put: to convey coal in the mine, e.g. from the working to the tramway.
hush
A part of a mine or quarry where ore is to be, or has been, excavated by an artificial flow of water.
hushing
The use of a heavy discharge of water to uncover a mineral vein or wash ore.
hutch
A jig or trough for ore dressing or washing ore.
HVTL
Initialism of high-voltage transmission line.
hybrid
Something of mixed origin or composition; often, a tool or technology that combines the benefits of formerly separate tools or technologies.
hybridization
the conversion of a fleet of vehicles to hybrids.
hydration
nounConstruction
The chemical reaction by which a substance (such as cement) combines with water, giving off heat to form a crystalline structure in its setting and hardening.