Definition from Wiktionary, the free dictionary
Pikachu (plural Pikachu or Pikachus)
- (video games, anime, manga) A small yellow mouse-like Pokémon that has red cheeks and a tail shaped like a lightning bolt, and has electricity-related powers.
For usage examples of this term, see Citations:Pikachu.
The official Pokémon products and video games use the plural Pikachu, although Pikachus is commonly used elsewhere.