Monster/ˈmɑːnstər/nounBig, scary creature often in stories or movies.The monster under the bed scared the child. Often appears as...sea monster monster movie Definition 1 of 5Pro Tip 1/2Not Real Understand that monsters in stories are fictional and used to add excitement. The movie featured a monster that could control minds. Pro Tip 2/2Cultural Figures Certain monster names like Dracula or Godzilla are known across cultures as famous monsters. Dracula is a popular monster in vampire fiction.