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From Proto-Indo-European *key- (bright, burning), whence also चित्र (citra). Cognate with Old Norse hárr (grey) and Gothic 𐌷𐌰𐌹𐍃 (hais, torch).


  • (Vedic) IPA(key): /kɐj.t̪ú/
  • (Classical) IPA(key): /ˈkeː.t̪u/
  • Noun[edit]

    केतु (ketúm

    1. lamp, flame, torch
    2. bright appearance, clearness, brightness
    3. (in the plural) rays of light
    4. day-time
    5. apparition, form, shape
    6. sign, mark, ensign, flag, banner
    7. any unusual or striking phenomenon, comet, meteor, falling star
    8. Ketu: the dragon's tail or descending node (considered in astronomy as the 9th planet, and in mythology as the body of the demon Saiṃhikeya which was severed from the head or Rahu by Vishnu at the churning of the ocean, but was rendered immortal by having tasted the amṛta)


    Masculine u-stem declension of केतु
    Nom. sg. केतुः (ketuḥ)
    Gen. sg. केतोः (ketoḥ)
    Singular Dual Plural
    Nominative केतुः (ketuḥ) केतू (ketū) केतवः (ketavaḥ)
    Vocative केतो (keto) केतू (ketū) केतवः (ketavaḥ)
    Accusative केतुम् (ketum) केतू (ketū) केतून् (ketūn)
    Instrumental केतुना (ketunā) केतुभ्याम् (ketubhyām) केतुभिः (ketubhiḥ)
    Dative केतवे (ketave) केतुभ्याम् (ketubhyām) केतुभ्यः (ketubhyaḥ)
    Ablative केतोः (ketoḥ) केतुभ्याम् (ketubhyām) केतुभ्यः (ketubhyaḥ)
    Genitive केतोः (ketoḥ) केत्वोः (ketvoḥ) केतूनाम् (ketūnām)
    Locative केतौ (ketau) केत्वोः (ketvoḥ) केतुषु (ketuṣu)



    • Sir Monier Monier-Williams (1898) A Sanskrit-English dictionary etymologically and philologically arranged with special reference to cognate Indo-European languages, Oxford: Clarendon Press, page 0309