radarとは 意味・読み方・使い方

語源

A radar screen (noun sense 1) of the USS Intrepid, an American aircraft carrier which is now a museum ship in New York City, New York, U.S.A.

A radar screen (noun sense 1) of the SG radar system photographed in 1945, not long after radar was invented. SG radar was a United States Navy surface-search radar developed for large warships.

The noun is derived from RADAR by anacronymic evolution. RADAR is an acronym of ra(dio) d(etection) a(nd) r(anging) which was coined by Lieutenant-Commander Samuel M. Tucker and Lieutenant-Commander F. R. Furth of the United States Navy in November 1940.

The verb is probably derived from the noun.

発音

• (Received Pronunciation) IPA: /ˈɹeɪdɑː/
• (General American) IPA: /ˈɹeɪˌdɑɹ/
• 韻: -eɪdɑː(ɹ)
• ハイフネーション: ra‧dar

名詞

radar (countable and uncountable, plural radars) (originally US)

1. (uncountable) In full primary radar: a method of detecting a distant object and determining its position, velocity, or other characteristics by analysing radio waves (usually microwaves) which are sent towards the object and which reflect off its surfaces; also, the field of study of this method.

   Alternative form: RADAR (alternative letter-case form, dated)

   Hypernym: imaging

   Hyponyms: active radar, Doppler radar

   Coordinate terms: lidar (uses light waves), sodar (uses sound waves), sonar (uses sound waves)

   They were able to find the enemy fleet using radar.

   1. (uncountable, by extension) In full secondary radar: a method of detecting a distant object and determining its position, velocity, or other characteristics by analysing signals transmitted by the object in response to radio waves sent towards the object.
   2. (countable) Often preceded by a descriptive word: a system using one of the above detection methods, differentiated by configuration or platform, frequency, power, and other technical attributes.

      The Ministry of Defence funded the development of an entirely new radar and improved avionics.

      • 2002, Brian Jonathan Wolk, “Producing Inconsistencies in Various Cases”, in Ohio Traffic Tickets are for the Birds: A Practical Defense Manual for Juveniles and Adults, Lincoln, Neb.: Writers Club Press, iUniverse, →ISBN, section 4 (Producing Inconsistencies), page 145:

        Evidence as to the audio monitor's reading is required to prove the [police] officer used the radar unit properly, and must be shown in order to secure a conviction for speeding when using radar.

        Referring to the use of a radar speed gun for detecting speeding vehicles.

   3. (countable) An installation of the apparatus for operating one of the above detection systems.

      Each of these aircraft has been upgraded with a new radar and a more powerful engine.

      • 1941 October 2, Arthur Krock, “The value of armament to merchant ships”, in The New York Times (C section)‎, New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 7 November 2025, page 24, column 5:

        [T]he [depth] bombs must be tied to a grid of listening devices, radars and plotting instruments.

2. (uncountable, by extension) Often preceded by a descriptive word: a natural (for example, in an animal such as a bat) or human-made detection method based on the analysis of reflected signals other than radio waves, as light waves or sound waves; (countable) an instance of this.
3. (countable, figurative) A superior ability to detect something; an awareness, an intuition.

   Hyponym: gaydar

   His sensitive radar for hidden alliances keeps him out of trouble.

   • 1949, Arthur Miller, Death of a Salesman: Certain Private Conversations […], New York, N.Y.: Viking Press, →OCLC, Act II, page 100:

     Stanley: Geez, how'd ya know? / Happy: I got radar or something.

   • 2021 April 29, Jamie Jackson, “Edinson Cavani and Bruno Fernandes help Manchester United hit Roma for six”, in Katharine Viner, editor, The Guardian‎, London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 27 August 2025:

     It [a goal] came inside 50 minutes and moments later [Edinson] Cavani should have had a 12th. [Paul] Pogba and [Luke] Shaw combined before the left-back's cross teed up the striker but his radar was awry.

派生語

動詞

radar (third-person singular simple present radars, present participle radaring, simple past and past participle radared)

1. (transitive) To use a radar apparatus (noun sense 1, sense 1.1, or sense 2) on (someone or something); to scan (someone or something) with, or as if with, radar.
   • 1961, Irving Shulman, chapter 8, in West Side Story: A Novelization […], New York, N.Y.: Pocket Books, published November 1967, →ISBN, page 137:

     This was no ordinary signal for help that Baby-John was radaring to outer space, but a call that had to be heeded, for he had just seen two hard guys go down for the final count— […]

   • 1991 January, Elizabeth Egloff, “Swan Play”, in Jocelyn Beard, editor, The Best Women’s Stage Monologues of 1990 (Applause Acting Series), Newbury, Vt.: Smith and Kraus, →ISBN, page 69:

     I don't think men are born on this planet. I think men are born on the planet Pluto and they have them molecularly disassembled and radar-ed to the earth.

   • 2002, Brian Jonathan Wolk, “Producing Inconsistencies in Various Cases”, in Ohio Traffic Tickets are for the Birds: A Practical Defense Manual for Juveniles and Adults, Lincoln, Neb.: Writers Club Press, iUniverse, →ISBN, section 4 (Producing Inconsistencies), page 156:

     You want to cross-examine an officer about his competence with regards to radar and the radar he used to ticket you with. He radars you while he's sitting in his patrol vehicle under a bridge.

   • 2021, Francisco Martínez, “Putting Objects to Work”, in Ethnographic Experiments with Artists, Designers and Boundary Objects: Exhibitions as a Research Method, London: UCL Press, →DOI, →ISBN, page 41:

     [I]n Humans Need Not to Count the artists Varvara & Mar presented a robot clicker counting the number of visitors to the gallery […] The piece also evoked the mythification of artificial intelligence, attributing wisdom and consciousness to what is, in the case of the installation, instrumental intelligence (the robotic hand merely does two moves: radaring and clicking).

参照

Further reading

• radar on Wikipedia.Wikipedia

アナグラム

• Ardra