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From reptile +‎ -ian, replacing earlier reptilious and adjectival reptile.


  • (UK) IPA(key): /ɹepˈtɪliən/
  • (US) IPA(key): /ɹɛpˈtɪljən/, /ɹɛpˈtɪliən/


reptilian (comparative more reptilian, superlative most reptilian)

  1. (zoology) Of or relating to the members of the class Reptilia.
  2. Reptilelike.
  3. (figuratively) Unthinking, low, base, contemptible.
  4. (figuratively) Cold-blooded, treacherous, unavoidably selfish and hostile.


Derived termsEdit



reptilian (plural reptilians)

  1. A reptilian animal: a reptile.
  2. (figuratively) A reptilian person, especially (ethnic slur) a Jew.
  3. (science fiction) A reptilian alien, especially (ufology, often capitalized) of a shapeshifting race purported to secretly control the world.
    • 2001, Caroline Tiger, The UFO Hunter’s Handbook: A Field Guide to the Paranormal, →ISBN, page 62-63:
      More evolved than the Grays or Reptilians, the Humanoids seem to feel some sort of kinship with humans and are likely to be kind.[…] Some researchers believe the Grays are merely preparing the way for a full-scale invasion of Reptilian aliens.
    • 2010, Chico Penteado, Talking to the Reptilians-A Report from Brazil, →ISBN, page 11:
      Such powerful human families would descend upon the reptilians themselves and they would be willing to do just anything to retain their power.
    • 2011, Collin Robert Bowling, A New Order of the Ages, →ISBN:
      The reptilians are the creation of the Carians.
    • 2015, Marty Crump, Eye of Newt and Toe of Frog, Adder's Fork and Lizard's Leg, →ISBN:
      Reptilians generally are envisioned as half snake, half human, and they are thought to have come from the Alpha Draconian star system.