(mycology) A thin layer of tissue which completely surrounds a developing mushroom.

(informal, astronomy, archaic) A galaxy

plural of universal set

In fiction, the extension of a media franchise (i.e. a television show, series of feature films, etc.) with other media (generally comics and original novels), often with the result being that the stories described in the other media are not considered canon in the original.

plural of expanded universe

(logic) The set of all entities over which quantifiers—including "for all" and "there exists"—range.

plural of parallel universe

(US, slang) New York City

(slang, Canada, derogatory) The city of Toronto, due to its self-absorbed haughty attitude.

(religion) God / (idiomatic) A powerful person. / (idiomatic, finance, business) A highly successful business person.