the 18th letter of the Roman alphabet
<noun.communication>

R

r

(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
<noun.quantity>

R

gas constant

universal gas constant

a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
<noun.quantity>

R

roentgen

a combination of blues and jazz that was developed in the United States by Black musicians; an important precursor of rock 'n' roll
<noun.communication>

R and B

rhythm and blues

street names for flunitrazepan
<noun.artifact>

Mexican valium

R-2

circle

forget me drug

roach

roofy

rope

rophy

American psychologist (born in England) who developed a broad theory of human behavior based on multivariate research (1905-1998)
<noun.person>

Cattell

R. B. Cattell

Ray Cattell

Raymond B. Cattell

Raymond Bernard Cattell

United States architect who invented the geodesic dome (1895-1983)
<noun.person>

Buckminster Fuller

Fuller

R. Buckminster Fuller

Richard Buckminster Fuller

English aeronautical engineer (1895-1937)
<noun.person>

Mitchell

R. J. Mitchell

Reginald Joseph Mitchell

of or relating to or supporting Romanism
<adj.pert>

R.C.

Roman

Roman Catholic

Romanist

papist

papistic

papistical

popish

romish

sample sentences

"the Roman Catholic Church"

a state in New England; one of the original 13 colonies; the smallest state
<noun.location>

Little Rhody

Ocean State

R.I.

RI

Rhode Island

a motorized wheeled vehicle used for camping or other recreational activities
<noun.artifact>

R.V.

RV

recreational vehicle

(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere
<noun.location>

RA

celestial longitude

right ascension

sample sentences

"one hour of right ascension equals fifteen degrees"

a Marxist and Maoist terrorist organization in Germany; a network of underground guerillas who committed acts of violence in the service of the class struggle; a successor to the Baader-Meinhof Gang; became one of Europe's most feared terrorist groups; disbanded in 1998
<noun.group>

RAF

Red Army Faction

the airforce of Great Britain
<noun.group>

RAF

Royal Air Force

radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid gland
<noun.cognition>

RAIU

radioactive iodine uptake test

the most common computer memory which can be used by programs to perform necessary tasks while the computer is on; an integrated circuit memory chip allows information to be stored or accessed in any order and all storage locations are equally accessible
<noun.artifact>   freq. cnt.: 2 freq. cnt.: 1 freq. cnt.: 1

RAM

random access memory

random memory

random-access memory

read/write memory

(computer science) a virtual drive that is created by setting aside part of the random-access memory to use as if it were a group of sectors
<noun.artifact>

RAM disk

sample sentences

"access to a RAM disk is very fast but the data it contains is lost when the system is turned off"

the network in the reticular formation that serves an alerting or arousal function
<noun.body>

RAS

reticular activating system

a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus
<noun.body>   freq. cnt.: 5 freq. cnt.: 5

RBC

erythrocyte

red blood cell

the federal police force of Canada
<noun.group>

Mounties

RCMP

Royal Canadian Mounted Police

an investment trust that owns and manages a pool of commercial properties and mortgages and other real estate assets; shares can be bought and sold in the stock market
<noun.group>

REIT

Real Estate Investment Trust

a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
<noun.state>

REM

REM sleep

paradoxical sleep

rapid eye movement

rapid eye movement sleep

a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
<noun.state>

REM

REM sleep

paradoxical sleep

rapid eye movement

rapid eye movement sleep

a widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
<noun.body>

RES

reticuloendothelial system

a complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone
<noun.body>

RF

reticular formation

a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland
<noun.substance>

RF

releasing factor

releasing hormone

free government delivery of mail in outlying country areas
<noun.communication>

RFD

rural free delivery

any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones; each of these hormones causes the anterior pituitary to secrete a specific hormone
<noun.body>

RH

hypothalamic releasing factor

hypothalamic releasing hormone

releasing factor

releasing hormone

a paramilitary group of Protestants in Northern Ireland that tries to prevent any political settlement with the Irish Republic; attacks interests of Catholic civilians in Northern Ireland; responsible for arson and bombing and murder
<noun.group>

RHD

Red Hand Defenders

a state in New England; one of the original 13 colonies; the smallest state
<noun.location>

Little Rhody

Ocean State

R.I.

RI

Rhode Island

law intended to eradicate organized crime by establishing strong sanctions and forfeiture provisions
<noun.communication>

RICO

RICO Act

Racketeer Influenced and Corrupt Organizations Act

anti-racketeering law

law intended to eradicate organized crime by establishing strong sanctions and forfeiture provisions
<noun.communication>

RICO

RICO Act

Racketeer Influenced and Corrupt Organizations Act

anti-racketeering law

a radical terrorist group that broke away in 1997 when the mainstream Provisional IRA proposed a cease-fire; has continued terrorist activities in opposition to any peace agreement
<noun.group>

Dissident Irish Republican Army

RIRA

Real IRA

Real Irish Republican Army

(computer science) a kind of computer architecture that has a relatively small set of computer instructions that it can perform
<noun.attribute>

RISC

reduced instruction set computer

reduced instruction set computing