Here's why:
* Proper Noun: "Yahtzee" is primarily a proper noun, referring specifically to the popular dice game.
* Trademarked: The game itself is trademarked, which further limits its inclusion in general dictionaries.
* Informal Usage: "Yahtzee" is primarily used in casual conversation and within the context of the game.
Where You Might Find It:
* Specialized Dictionaries: You might find "Yahtzee" in dictionaries focused on games, slang, or proper nouns.
* Online Dictionaries: Some online dictionaries, particularly those focusing on slang or informal language, may include "Yahtzee."
However, you can be sure that most people understand what "Yahtzee" refers to, even if it's not formally in a dictionary.