A kind of flexible, porous aerogel that can form a film.

(fandom slang) The fictional world, or universe, which serves as the setting for the Marvel Comics and film series featuring the characters, the X-Men.

A symbol composed of two perpendicular lines (✗), especially when representing negation or lack of verification.

plural of X mark

plural of X-junction

Unix-like operating system (e.g., Linux, macOS, Solaris, etc.).

(genetics) Associated with the X chromosome.

(of films) strictly reserved for adult viewing, pornographic

The theory that employees are inherently lazy and irresponsible and will tend to avoid work unless closely supervised and given incentives.

A circle in the middle of a shooting target's bullseye used to determine the winner in the event of a tie.