portcullis (noun)

1. During medieval times, the portcullis was frequently used as a defensive mechanism to protect castles from invaders.

2. The painting depicted an imposing castle with a portcullis guarding its entrance, adding a touch of authenticity to the artwork.

3. In the futuristic science fiction novel, the protagonist struggled to bypass the technologically advanced portcullis guarding the entrance to the villain's lair.

4. The architect incorporated a beautifully crafted portcullis into the entrance of the modern castle-inspired mansion, giving it an elegant and noble touch.