TRACER


Meaning of TRACER in English

/ ˈtreɪsə(r); NAmE / noun

1.

a bullet or shell (= a kind of bomb) that leaves a line of smoke or flame behind it

2.

( technical ) a radioactive substance that can be seen in the human body and is used to find out what is happening inside the body

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.