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A form of electromagnetic radiation with high frequency.
Are you gonna do an X-ray on Z today balla?
by Mr. be safe always June 15, 2014
The only other word in the english language even worth mentioning that begins with the letter "X", besides xylophone. "X" is truly the gayest of the letters.
Teacher: Hey kids! What word begins with the letter "X"?

Kids: What the fuck do you think, moron? Fucking X-Ray and Xylophone, bitch!
by Poor boy from a poor family November 28, 2003