ra·di·o·trac·er 
(rādē-ō-trā′sər)
(rādē-ō-trā′sər)n.
A radioactive tracer.
- internuncio
- interoceptive
- interoceptor
- interoffice
- interoperability
- interoperable
- interpeduncular
- interpenetrate
- interpersonal
- interpersonally
- interphase
- interphone
- interplanetary
- interplay
- interplead
- interpleader
- interpolate
- interpolation
- interpolative
- interpolator
- interposal
- interpose
- interposer
- interposition
- interpret