rock glass
Metastable glass of volcanic or dyke origin.
Entries starting with R
443 entries.
rocker arm
A valvetrain component that typically transfers the motion of a pushrod in an overhead valve internal combustion engine to the corresponding intake or exhaust valve.
rocker switch
An electromechanical device used to control electrical circuits by rocking or pivoting a hinged actuator around a central axis to connect or disconnect contacts.
rocking tree
The axle from which the lay of a loom is suspended.
rockpicker
A person, machine, or machine component that cleans out the rocks during ore dressing.
rockpicking
Cleaning out the rocks during ore dressing. Done by a person, machine, or machine component.
rod
nounPlumbing
A drain rod, being a set of segmented rods with interlocking connectors designed to remain attached even under rotation in use.
rodbuster
A concrete-reinforcing ironworker.
rodding
A system of rods etc. used for movement.
rode
The line from a vessel to its anchor.
roger
Received (used in radio communications to acknowledge that a message has been received and understood)
roger that
Received (used in radio communications to acknowledge that a message has been received and understood)
rogue
To cull; to destroy plants not meeting a required standard, especially when saving seed, rogue or unwanted plants are removed before pollination.
ROIP
Radio over IP: ROIP extends VOIP to radio repeaters and base stations.
roll cage
nounAutomotive
A frame built in or around the driver and passenger compartment of a vehicle to protect its occupants from being injured in an accident, particularly if the vehicle rolls over.
roll hoop
nounAutomotive
A roll bar behind the headrest of a seat in a vehicle.
roll off
To show reduced response at the upper or lower limits of a frequency range.
roll rate
The rate at which an aircraft can change its roll attitude, typically expressed in degrees per second
roll-to-roll
adjectiveManufacturing
Involving the use of a continuous roll of substrate material that is fed through various processing steps such as printing, coating, or etching.
rollback
A form of flatbed truck adapted or designed specifically to carry other vehicles, for use in recovery (wrecking, salvage) or for transporting.
Rollbock
A bogie used to carry a railway carriage on a line of different gauge to the one it was built for, usually a narrower gauge.
roller blind
A destination indicator blind on buses and trains having two rollers, top and bottom. It can be rolled to display various destinations and route numbers through a small window.
roller machine
nounMetalworking
A type of manufacturing equipment containing two or more rollers through which raw metal is fed.
rollerman
nounMetalworking
A person employed in a roller mill to insert the hot metal into the rolls.
rolley
A horse-drawn wheeled vehicle used in a mine.
rolling blackout
An intentional disruption of electric service to different areas in a region to conserve power.
rolling brownout
Of firefighting services, a deliberate reduction in multiple service areas during staggered times.
rolling stock
nounRail equipment
All vehicles that move on a railway, powered or unpowered.
rolling stop
nounAutomotive
An automobile driving maneuver in which a driver slows down, but does not completely stop, at a stop sign.
rollover
The sudden ignition of flammable gases (produced by pyrolysis in an oxygen-poor environment) near the ceiling of a room or other enclosed space.
rollover cable
A kind of cable used to connect consoles to computers, having the pinouts on one end reversed with respect to the other.
rolly
Alternative form of rolley (“horse-drawn wheeled vehicle used in a mine”).
ROM
Acronym of read-only memory.
Roman
A single letter or character in Roman type.
RON
nounAutomotive
Abbreviation of research octane number.
ronnagram
An SI unit of mass equal to 10²⁷ grams. Symbol: Rg
ronnametre
An SI unit of length equal to 10²⁷ metres. Symbol: Rm
ronnasecond
An SI unit of time equal to 10²⁷ seconds. Symbol: Rs. (= quintillions of years, a hypothetical time span that is meaningless except in speculative contexts such as theoretical physics, philosophy, religion, and humorous hyperbole)
rontogram
An SI unit of mass equal to 10⁻²⁷ grams. Symbol: rg
rontosecond
An SI unit of time equal to 10⁻²⁷ seconds. Symbol: rs
roof
The surface or bed of rock immediately overlying a bed of coal or a flat vein.
roof assembly
an assembly of interacting roof components including the roof deck, vapor retarder (if needed), insulation and roof covering.
roof curb
nounConstruction
A raised frame used to mount mechanical units (such as air conditioning or exhaust fans), skylights, etc. on a roof.
roof-plate
nounConstruction
A wall plate that receives the lower ends of the rafters of a roof.
roofbolt
A safety bolt installed in the roof of an underground mine.
roofbolter
A machine for installing roofbolts.
roofstone
The stone or rock layer immediately above a coal seam.
room
An area for working in a coal mine.
room and pillar
A variant of breast stoping in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars.
roomette
nounRail equipment
A small private compartment, for one person, in a railroad sleeping car.
root
The section of a wing immediately adjacent to the fuselage.
rooter
nounWoodworking
A blade for producing a narrow groove in a piece of wood.
rootstock
A healthy and vigorous-rooted plant that is used in grafting, most commonly as a sound base to support a scion that bears desirable fruit in orchard culture.
rope
A long thin segment of soft clay, either extruded or formed by hand.
rosa mundi
A sport of the apothecary rose, featuring semidouble flowers with deep, pink stripes on a white or pale background.
rosehead
nounWoodworking
A conical drillbit that has radiating blades.
rosin paper
nounConstruction
A heavy-duty felt paper used in construction as a layer under flooring and siding.
rot-steep
verbManufacturing
To steep (cotton) to remove impurities.
rotary converter
A machine which converts alternating current to direct current, or vice versa.
rotary switch
A switch that is operated by turning a knob.