noun · 7 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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General-American:/ɹiˈæktɚ/
Received-Pronunciation:/ɹiːˈæktə/
Southern-England:Recorded audio is listed in the source snapshot.
US:Recorded audio is listed in the source snapshot.
rhymes with -æktə(ɹ)
homophone: reacter
CMU ARPABET:R IY0 AE1 K T ER0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
A person who responds to a suggestion, stimulation or other influence.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: reacter
Antonyms: none provided
2
noun
Meaning 2
A structure used to contain chemical or other reactions.
Definition source: English Wiktionary via Wiktextract
an electrical device used to introduce reactance into a circuit
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: electrical device
Narrower terms: coil
History
Etymology
Etymology tree English react Proto-Indo-European *-tōr Proto-Italic *-tōr Latin -tor Latin -ātor Old French -eorbor. Middle English -our ▲ Latin -torlbor. English -or English reactor From react + -or.
Across languages
Translations
86 source translations are retained for this English entry.
Finnish:
reagoija
— person who behaves in response to a suggestion, stimulation or some other influence
Belarusian:
рэактар
(reaktar)
— structure used to contain chemical or other reactions
Catalan:
reactor
— structure used to contain chemical or other reactions
Chinese Mandarin:
反應器 /反应器
(fǎnyìngqì)
— structure used to contain chemical or other reactions
Dutch:
reactor
— structure used to contain chemical or other reactions
Finnish:
reaktori
— structure used to contain chemical or other reactions
French:
réacteur
— structure used to contain chemical or other reactions
German:
Reaktor
— structure used to contain chemical or other reactions
Irish:
soitheach imoibriúcháin
— structure used to contain chemical or other reactions
Polish:
reaktor
— structure used to contain chemical or other reactions
Portuguese:
reator
— structure used to contain chemical or other reactions
Russian:
реактор
(reaktor)
— structure used to contain chemical or other reactions
Swedish:
reaktor
— structure used to contain chemical or other reactions
Welsh:
adweithydd
— structure used to contain chemical or other reactions
Albanian:
reaktor
— device which uses atomic energy to produce heat
Arabic:
مُفَاعِل
(mufāʕil)
— device which uses atomic energy to produce heat
Armenian:
ռեակտոր
(ṙeaktor)
— device which uses atomic energy to produce heat
Azerbaijani:
reaktor
— device which uses atomic energy to produce heat
Belarusian:
рэа́ктар
(reáktar)
— device which uses atomic energy to produce heat
Bulgarian:
реа́ктор
(reáktor)
— device which uses atomic energy to produce heat
Catalan:
reactor
— device which uses atomic energy to produce heat
Chinese Mandarin:
反應堆 /反应堆
(fǎnyìngduī)
— device which uses atomic energy to produce heat
Chinese Mandarin:
反應爐 /反应炉
(fǎnyìnglú)
— device which uses atomic energy to produce heat
Czech:
reaktor
— device which uses atomic energy to produce heat
Danish:
reaktor
— device which uses atomic energy to produce heat
Dutch:
reactor
— device which uses atomic energy to produce heat
Estonian:
reaktor
— device which uses atomic energy to produce heat
Finnish:
reaktori
— device which uses atomic energy to produce heat
French:
réacteur
— device which uses atomic energy to produce heat
Georgian:
რეაქტორი
(reakṭori)
— device which uses atomic energy to produce heat
German:
Reaktor
— device which uses atomic energy to produce heat
German:
Atomreaktor
— device which uses atomic energy to produce heat
German:
Meiler
— device which uses atomic energy to produce heat
German:
Atommeiler
— device which uses atomic energy to produce heat
Hebrew:
כּוּר
(kur)
— device which uses atomic energy to produce heat
Hungarian:
reaktor
— device which uses atomic energy to produce heat
Indonesian:
reaktor
— device which uses atomic energy to produce heat
Interlingua:
reactor
— device which uses atomic energy to produce heat
Irish:
imoibreoir
— device which uses atomic energy to produce heat
Italian:
reattore nucleare
— device which uses atomic energy to produce heat
Japanese:
原子炉
(genshiro)
— device which uses atomic energy to produce heat
Kazakh:
реактор
(reaktor)
— device which uses atomic energy to produce heat
Korean:
원자로
(wonjaro)
— device which uses atomic energy to produce heat
Kyrgyz:
реактор
(reaktor)
— device which uses atomic energy to produce heat
Latvian:
reaktors
— device which uses atomic energy to produce heat
Lithuanian:
reaktorius
— device which uses atomic energy to produce heat
Macedonian:
реа́ктор
(reáktor)
— device which uses atomic energy to produce heat
Norwegian Bokmål:
reaktor
— device which uses atomic energy to produce heat
Norwegian Nynorsk:
reaktor
— device which uses atomic energy to produce heat
Persian:
رآکتور
(re-âktor)
— device which uses atomic energy to produce heat
Polish:
reaktor
— device which uses atomic energy to produce heat
Portuguese:
reator
— device which uses atomic energy to produce heat
Romanian:
reactor
— device which uses atomic energy to produce heat
Russian:
реа́ктор
(reáktor)
— device which uses atomic energy to produce heat
Serbo-Croatian:
рѐактор
— device which uses atomic energy to produce heat
Serbo-Croatian:
rèaktor
— device which uses atomic energy to produce heat
Slovak:
reaktor
— device which uses atomic energy to produce heat
Slovene:
reaktor
— device which uses atomic energy to produce heat
Spanish:
reactor
— device which uses atomic energy to produce heat
Swedish:
reaktor
— device which uses atomic energy to produce heat
Tajik:
реактор
(reaktor)
— device which uses atomic energy to produce heat
Thai:
เครื่องปฏิกรณ์
— device which uses atomic energy to produce heat
Thai:
เตาปฏิกรณ์
— device which uses atomic energy to produce heat
Turkish:
reaktör
— device which uses atomic energy to produce heat
Ukrainian:
реа́ктор
(reáktor)
— device which uses atomic energy to produce heat
Uzbek:
reaktor
— device which uses atomic energy to produce heat
Vietnamese:
lò phản ứng
— device which uses atomic energy to produce heat
Welsh:
adweithydd
— device which uses atomic energy to produce heat
Arabic:
مُفَاعِل
(mufāʕil)
— chemical substance which responds to another substance
Bulgarian:
реаге́нт
(reagént)
— chemical substance which responds to another substance
Catalan:
reactiu
— chemical substance which responds to another substance
Dutch:
reagens
— chemical substance which responds to another substance
Finnish:
reaktori
— chemical substance which responds to another substance
French:
réactif
— chemical substance which responds to another substance
German:
Reagenz
— chemical substance which responds to another substance
Interlingua:
reagente
— chemical substance which responds to another substance
Irish:
imoibreoir
— chemical substance which responds to another substance
Italian:
reattivo
— chemical substance which responds to another substance
Italian:
reagente
— chemical substance which responds to another substance
Kazakh:
әрекеткі
(äreketkı)
— chemical substance which responds to another substance
Polish:
reagent
— chemical substance which responds to another substance
Portuguese:
reagente
— chemical substance which responds to another substance
Portuguese:
reativo
— chemical substance which responds to another substance
Russian:
реаге́нт
(reagént)
— chemical substance which responds to another substance
Russian:
реакти́в
(reaktív)
— chemical substance which responds to another substance
Swedish:
reagent
— chemical substance which responds to another substance