radiotechnetium
radioactive technetium.

radioterbium
radioactive terbium

radiothallium
radioactive thallium

radiothulium
radioactive thulium

radiouranium
radioactive uranium.

radioxenon
radioactive xenon

radioytterbium
radioactive ytterbium

radioyttrium
radioactive yttrium

radon
The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
Radon-222 (22286Rn), the most stable isotope of said element.

rafale
A short, intense burst of artillery fire from a number of weapons fired with the intention of overwhelming resistance or routing an attacking force.

rafales
plural of rafale

railcarful
The amount that will fit in a railcar.

railcarfuls
plural of railcarful

railful
The amount of clothing that can be held on a rail.

railfuls
plural of railful

rainfall
The amount of rain that falls on a single occasion
The occurrence of liquid precipitation, the fall of rain.

rainfalls
plural of rainfall

rakings
plural of raking

randomness
The property of all possible outcomes being equally likely.
A type of circumstance or event that is described by a probability distribution.
A measure of the lack of purpose, logic, or objectivity of an event.

randomnesses
plural of randomness

rangeabilities
plural of rangeability

rangeability
A measure of the range of signal values over which a particular mechanical device is reliable.

rangefinder
Any of several designs of optical (or other) instrument used to measure the distance to an object
Abbreviation of rangefinder camera.

rangefinders
plural of rangefinder

rapefest
An event involving a large amount of raping.

rapefests
plural of rapefest

rappen
A unit of currency in Switzerland and Liechtenstein, equal to one-hundredth of a Swiss franc.

rareties
plural of rarety

rarety
Alternative spelling of rarity.

raritie
Obsolete spelling of rarity.

rarities
plural of rarity

rarity
A measure of the scarcity of an object.
Thinness; the property of having low density
A rare object.

ratemeter
Any of several devices that measure the average rate of radioactive emissions over a specified time interval.

ratemeters
plural of ratemeter

rati
Alternative form of ratti (“Indian unit of measure”).

ratings
plural of rating

ratiometer
A measurement device used in ohmmeters, having two coils, one connected via a series resistor to the battery supply and the other connected to the same battery supply via a second resistor and the resistor under test. The indication on the meter was proportional to the ratio of the currents through the two coils.

ratiometers
plural of ratiometer

ratiometrics
ratiometric measurement
ratiometric fluorescence

rationals
plural of rational

rationes
plural of ratio (“ratio decidendi”)

ratis
plural of rati

rattee
Alternative form of ratti (“Indian unit of measure”).

rattees
plural of rattee

ratteries
plural of rattery

rattery
A place where rats are housed in large numbers, usually for the purpose of breeding
apostasy; traitorousness

ratti
A traditional Indian unit of measure for mass, approximately 0.1215 grams.

rattis
plural of ratti

rayleigh
A unit of brightness (of the sky at night) equal to 10¹⁰/4π quanta per square meter per second per steradian

rayleighs
plural of rayleigh

rd
Abbreviation of road.
Symbol for rad (unit of measure for absorbed dose of radiation).
Abbreviation of round.

rds
plural of rd

readout
A display, particularly one that presents numerical data.
The information, usually a measurement, shown on such a display.
The information output from a computer in a readable form.
An account of the topics discussed in a meeting, especially in diplomatic or political contexts.

readouts
plural of readout

reais
plural of real (Brazilian currency)

reals
plural of real

reamage
An amount of paper measured in reams.

reamages
plural of reamage.

rebits
plural of rebit

receival
An amount (of goods, etc.) received.
A grain receival centre, a place where harvested wheat, oats, barley, etc are received for storage and later bulk shipping.

receivals
plural of receival

reciprocals
plural of reciprocal

recoverables
plural of recoverable

recti
plural of rectus

recto
The front side of a flat object which is to be examined visually, as for reading, such as a sheet, leaf, coin or medal.
The front side of a flat object which is to be examined visually, as for reading, such as a sheet, leaf, coin or medal.
A writ of right.

rectos
plural of recto

rectus
Any of several straight muscles in various parts of the body, as of the abdomen, thigh, eye etc.
Any of several straight muscles in various parts of the body, as of the abdomen, thigh, eye etc.

redosings
plural of redosing

reefgobies
plural of reefgoby

reefgoby
Any of a number of the species of genus Priolepis of true gobies.

refcount
A counter variable that keeps track of the number of references to a specific block of memory.

refcounts
plural of refcount

reflexmate
A chess puzzle in which white, moving first, must force black to deliver checkmate within a specified number of moves.

reflexmates
plural of reflexmate

refractometer
An optical instrument used to measure the refractive index of a substance.

refractometers
plural of refractometer

reggo
Alternative form of rego.

reggos
plural of reggo

regionful
the amount that a region can hold.

regionfuls
plural of regionful

rego
Registration for a motor vehicle.
The fee required for such registration.
The registration number of a motor vehicle, used by police to access registration details such as the identity of the owner.

regos
plural of rego

regression
An action of regressing, a return to a previous state.
An action of travelling mentally back in time.
A psychotherapeutic method whereby healing is facilitated by inducing the patient to act out behaviour typical of an earlier developmental stage.
An analytic method to measure the association of one or more independent variables with a dependent variable.
An equation using specified and associated data for two or more variables such that one variable can be estimated from the remaining variable(s).
The reappearance of a bug in a piece of software that had previously been fixed.
The diminishing of a cellular mass like a tumor, or of an organ size.
The making an exercise less straining to perform by manipulating the details of its performance like loaded weight, range of motion, angle, speed.

regressions
plural of regression

regs
plural of reg

regulo
any of a number of temperatures to which a gas oven may be set. e.g. regulo 4

regulos
plural of regulo

reluctivities
plural of reluctivity

reluctivity
The quantity equal to the reciprocal of magnetic permeability.

remeasurement
measurement again or anew

remeasurements
plural of remeasurement

renumberings
plural of renumbering

renumeration
The act or process of renumerating (counting or numbering again).

renumerations
plural of renumeration

repayables
plural of repayable

repdigit
A number composed only of one or more occurrences of one specific digit and no other digit.

repdigits
plural of repdigit

repeatabilities
plural of repeatability

repeatability
The property or quality of being repeatable.
The property or quality of being repeatable.

repertoreme
A unit of a cultural or linguistic repertoire.

repertoremes
plural of repertoreme

repetencies
plural of repetency

repetency
wave number

repunits
plural of repunit

resectabilities
plural of resectability

resectability
A measure of the expected benefits of a resection

residuals
plural of residual