X: n.:
symbol used to mark an error; as Xmas, Xtian.

X out: v.t.:
typewriter user's equivalent of the Delete key.

X-rated: adj.:
having too much sex and not enough violence to be successful in commercial theaters.

Xanadu: proper name:
capitol of the nation next to Shangri-La.

Xanthippe: proper name:
a classical Greek shrew, whose tongue had such bile as to make hemlock sweet by comparison.

Xenophobia: n.:
the great-grandmother of racism.

Xerox: proper name:
name of the ancient Persian god of paperwork; noted for his dry writing style.

Xylophone: n.:
a musical toy often gifted by grandparents to get revenge on their children.