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tracer SimpleWikiWiktionaryGoogle検索CollinsCambridgeLongmanLongman英和Learners 【 38242 】 【意味】 "[名詞] ammunition whose flight can be observed by a trail of smoke [例] The tracers lit up the sky. [例] The tracer bullets were flying overhead. [例] They could see the tracers flying through the air. [意味] 曳光弾, 曳光弾丸 ; [同義語] tracer bullet ; [上位語] ammo, ammunition ; [同義語群] 04462707-n" [名詞] (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes [例] The tracer was used to study the metabolism. [例] The tracer was injected into the patient's bloodstream. [例] They used a tracer to determine the amount of radiation exposure. ; [上位語] radioisotope ; [同義語群] 04462835-n "[名詞] an investigator who is employed to find missing persons or missing goods [例] The tracer found the missing person. [例] The tracer was able to find the missing item. [例] He was a tracer for the military. [意味] 探偵, 捜査員 ; [上位語] investigator, detective, police detective, tec ; [同義語群] 10719972-n [名詞] an instrument used to make tracings [例] The tracer was used to make a copy of the drawing. [例] She used a tracer to trace the outline of the drawing. [意味] トレース, トレース台, 透写用器具, トレース用具, 探測器 ; [上位語] instrument ; [派生] trace, describe, draw, delineate, line ; [同義語群] 04463017-n"