From QRZ.Com, the Icom handout, and Part 97 Of The FCC Rules -
Ham Radio Glossary - An overview of amateur radio terms.

XCVR
"Transceiver" (a unit integrating both a transmitter and a receiver).

XIT
"Transmit Incremental Tuning"; a common feature on HF radios that allows
the user to slightly change the transmit frequency while leaving the
receive frequency the same.

XYL
Short for Ex-Young Lady (Wife).
--- SBBSecho 3.20-Win32
* Origin: The Thunderbolt BBS - Little Rock, Arkansas (1:2320/33)