3 : to spread around as from a center

Synonyms

branch, diverge, fan; also diffuse, dispel, disperse, dissipate; fork, stem; divide, separate, split; scatter, splay, spread; arise, derive, emanate, flow, issue, proceed, spring

Antonyms

concentrate, converge, focus, funnel, meet

ra·di·a·tion noun 1 : the action or process of radiating

2 : the process of emitting radiant energy in the form of waves or particles; also : something (as an X-ray beam) that is radiated

radiation sickness noun : sickness that results from exposure to radiation and is commonly marked by fatigue, nausea, vomiting, loss of teeth and hair, and in more severe cases by damage to blood-forming tissue

radiation therapy noun : RADIOTHERAPY

ra·di·a·tor noun : any of various devices (as a set of pipes or tubes) for transferring heat from a fluid within to an area or object outside

1radical adjective [ORIGIN: ME, fr. LL radicalis, fr. L radic-, radix root]

1 : FUNDAMENTAL, EXTREME, THOROUGHGOING

2 : of or relating to radicals in politics

3 : marked by a considerable departure from the usual or traditional

— rad·i·cal·ism noun

— rad·i·cal·ly adverb

Synonyms

extreme, extremist, fanatic, rabid, revolutionary, ultra—more at EXTREME

broad-minded, liberal, nonorthodox, nontraditional, open-minded, progressive, unconventional, unorthodox—more at LIBERAL

2radical noun 1 : a person who favors rapid and sweeping changes in laws and methods of government

2 : FREE RADICAL; also : a group of atoms considered as a unit in certain reactions or as a subunit of a larger molecule

3 : a mathematical expression indicating a root by means of a radical sign; also : RADICAL SIGN

Synonyms

extremist, revolutionary; also leftist, red; progressive, reformer; anarchist, subversive; agitator, insurgent, insurrectionist, rebel; secessionist, separatist

Antonyms

moderate

rad·i·cal·ise British variant of RADICALIZE

rad·i·cal·ize verb -ized; -iz·ing : to make radical esp. in politics

— rad·i·cal·i·za·tion noun

radical sign noun : the sign √ placed before a mathematical expression to indicate that its root is to be taken

ra·dic·chio noun, plural –chios : a chicory with reddish variegated leaves

radii plural of RADIUS

1radio noun, plural ra·di·os 1 : the wireless transmission or reception of signals using electromagnetic waves

2 : a radio receiving set

3 : the radio broadcasting industry

— radio adjective

2radio verb : to communicate or send a message to by radio

ra·dio·ac·tiv·i·ty noun : the property that some elements or isotopes have of spontaneously emitting energetic particles by the disintegration of their atomic nuclei

— ra·dio·ac·tive adjective

radio astronomy noun : astronomy dealing with radio waves received from outside the earth's atmosphere

ra·dio·car·bon noun : CARBON 14

radio frequency noun : an electromagnetic wave frequency intermediate between audio frequencies and infrared frequencies used esp. for communication and radar signals

ra·dio·gram noun : a message transmitted by radio

ra·dio·graph noun : a photograph made by some form of radiation other than light; especially : an X-ray photograph

— radiograph verb

— ra·dio·graph·ic adjective

— ra·dio·graph·i·cal·ly adverb

— ra·di·og·ra·phy noun

ra·dio·iso·tope noun : a radioactive isotope

ra·di·ol·o·gy noun : the use of radiant energy (as X-rays and radium radiations) in medicine

— ra·di·ol·o·gist noun

ra·dio·man noun : a radio operator or technician

ra·di·om·e·ter noun : an instrument for measuring the intensity of radiant energy

— ra·dio·met·ric adjective

— ra·di·om·e·try noun

ra·dio·phone noun : RADIOTELEPHONE

ra·dio·sonde noun : a small radio transmitter carried aloft (as by balloon) and used to transmit meteorological data

ra·dio·tele·phone noun : a telephone that uses radio waves wholly or partly instead of connecting wires

— ra·dio·te·le·pho·ny noun

radio telescope noun : a radio receiver-antenna combination used for observation