ra·di·o·trac·er 
(rādē-ō-trā′sər)
(rādē-ō-trā′sər)n.
A radioactive tracer.
- whitebait
- white bass
- white birch
- white blood cell
- whiteboard
- white book
- white bread
- white-bread
- white bryony
- whitecap
- whitecapped
- white cedar
- white cell
- white chip
- white chocolate
- white clover
- white-coat hypertension
- white-collar
- white corpuscle
- white crappie
- white-crowned sparrow
- white daisy
- whited sepulcher
- white dwarf
- white elephant