WB whole blood
WBC white blood cell or white blood cell count
WBR whole body radiation
WD well developed
WF white female
WID widow, widower
WM white male
WN well nourished
WNL within normal limits
WO written order | weeks old | wide open.
WOP without pain
WPW Wolff-Parkinson-White
W-T-D wet to dry
W/U workup