U-boat
Nickname given to the General Electric Universal Series diesel-electric locomotives.
Terms starting with U
59 terms.
UART
Acronym of universal asynchronous receiver transmitter.
UBC
nameConstruction
Initialism of Uniform Building Code.
UCAS
nounRobotics
Initialism of uncrewed combat aerial system, unmanned combat aerial system, uncrewed combat aircraft system, or, unmanned combat aircraft system
UCAV
nounRobotics
Initialism of unmanned/uncrewed combat aerial vehicle.
UDS
nounAutomotive
Initialism of Unified Diagnostic Services.
ULCV
nounAutomotive
Initialism of ultralight combat vehicle or ultra-lightweight combat vehicle
ULF
Initialism of Ultra Low Frequency, the band of radio waves between 300 hertz and 3000 hertz.
ULSI
Abbreviation of ultra large scale integration.
ulster
nounManufacturing
A long, loose overcoat made of wool or other rough material, often called a greatcoat, which sometimes features an attached shoulder cape covering the back and sleeves, and which can sometimes be buttoned in front.
ultra high frequency
The frequency area from 300 MHz through 3 GHz, commonly used for TV broadcasting.
ultra large scale integration
An integration type for digital circuits that contain more than one million transistors providing hundreds of thousands of logic gates per chip.
ultra low frequency
Ultra Low Frequency, the band of radio waves between 300 hertz and 3000 hertz.
ultrasonic bath
A piece of industrial or laboratory equipment that consists of a container, or bath, used for cleaning, mixing, or homogenisation of objects or substances by sending ultrasonic vibrations through the liquid contained in it.
unbaste
verbManufacturing
To undo the basting of; to remove long or loose stitches from.
unbasted
adjectiveManufacturing
Not basted; not given long loose stitches.
uncanny valley
nounRobotics
A range of appearances, mannerisms, or behaviors of a humanoid figure that are subtly different from a human and thereby cause feelings of discomfort, such as fear or revulsion.
underactuate
To make less easily actuated or responsive.
underback
nounManufacturing
A vessel that receives the wort as it flows from the mashing tub.
underbust
nounManufacturing
The circumference of a woman's chest, measured under the breasts.
undercast
An air-passage crossing a road in a mine by means of an airtight box or channel beneath it.
undercloak
nounConstruction
A fixed underlayer of tile or fibre cement on a roof, to support the mortar above.
undercollar
Part of a garment that goes under the collar.
undercutter
A device for cutting into rock walls from below.
underdraught
nounMetallurgy
The situation where part of a formed or cast shape has a reverse taper or inward‑leaning surface that makes it difficult to remove from the die or mold.
underfiring
The state of being insufficiently fired or underfired.
underhand
nounManufacturing
The lower of two hands, the hand under the work.
underhole
To cut away or mine out the lower portion of a coal seam or a part of the underlay so as to win or get the overlying coal.
underkill
nounManufacturing
Insufficient disposal because of inadequate inspection criteria.
underlay
A piece of paper pasted under woodcuts, stereotype plates, etc. in a form, to bring them up to the necessary level for printing.
underlayer
A perpendicular shaft sunk to cut the lode at any required depth.
underride
nounAutomotive
A vehicle accident in which one vehicle partially slides underneath another.
undershift
A misalignment resulting from failure to shift gears far enough.
undertile
adjectiveManufacturing
Of or pertaining to an area or surface beneath or below tile.
underwrap
The portion of a garment that is overlapped by another portion, such as the hidden part of a wrap skirt or the edge that holds buttons which is hidden when a garment is buttoned up.
ungreen
verbManufacturing
To expose to air after dyeing in indigo so that the greenish color fades away.
uninterruptible power supply
A device or system that almost instantaneously provides emergency power in the case that main power fails.
union bug
A maker’s mark imprinted on a work to show that it is sanctioned by members of a trade union. It is often a tiny elongated rhomboid containing and surrounded by, in minuscule typeface, identifying names and the union’s local chapter number.
union station
nounRail equipment
A railroad station shared by more than one railroad company, usually to spread the costs and ease the logistics of serving a particular town by rail.
universal logic gate
A logic gate that can be used to re-create the function of all other logic gates.
unlooper
A device used to break a smart card's microcontroller out of an infinite loop state that makes it otherwise unusable.
unnoble
adjectiveMetallurgy
Of a metal, being at the lower end of the electrochemical series, i.e. oxidising readily.
unpick
verbManufacturing
To undo knitting in order to reuse the wool.
unport
To flow away from, and, thus, fail to enter, its intake or drain port.
unporting
The action or process of unporting.
unsmelted
adjectiveMetallurgy
Not smelted; not having been subjected to a smelting process; still in the state of being an unrefined ore.
untemper
verbMetallurgy
To deprive of temper
unterhefe
nounManufacturing
The yeast that forms at the bottom of the vat.
untopping
Removal of overburden from an old mine to allow continued economic operation.
up-over
A method of shaft excavation by drifting to a point below, and then raising instead of sinking.
upcast
The ventilating shaft of a mine out of which the air passes after having circulated through the mine.
upper garment
A piece of clothing that covers at least the chest of a human being and is worn as the top layer, for example a shirt or sweater.
UPS
Initialism of uninterruptible power supply/source.
upset
verbMetalworking
To thicken and shorten a soft or heated piece of metal, by forging or hammering on the end, to shape, for example, rivets or internal combustion engine valves.
upsetter
nounMetalworking
A kind of forging machine that moves horizontally.
upstand
nounPlumbing
A section of a roof covering or flashing which turns up against a vertical surface.
USART
Initialism of universal synchronous and asynchronous receiver-transmitter.
UTP
unshielded twisted pair — a type of cable used for computer networking and telecommunications
utters
Unwanted depressions or other marks on the surface of an object caused when a tool is pressed too hard or vibrates against the surface.