noun🔗ShareA compound, element, or isotope used to track the progress or history of a natural process."Scientists used a radioactive tracer to track the movement of water through the soil. "compoundelementchemistrybiologybiochemistrymedicinescienceprocessChat with AIVocabulary GamePractice Reading
noun🔗ShareA round of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired in the dark."The hunter used a tracer round to mark his target in the dark forest. "militaryweaponmaterialChat with AIVocabulary GamePractice Reading
noun🔗ShareThe act or state of tracking or investigating something."The police investigation is a tracer of the thief's movements. "actionprocessChat with AIVocabulary GamePractice Reading
noun🔗ShareA request to trace the movements of a person or an object, such as a shipment."The shipping company issued a tracer for the lost package. "communicationbusinessservicetechnologyindustryChat with AIVocabulary GamePractice Reading
noun🔗ShareA person who traces something."The art student became a skilled tracer, able to perfectly copy the intricate lines of the master drawing. "personjobChat with AIVocabulary GamePractice Reading
noun🔗ShareA device or instrument used to assist in making tracings."The art student used a special tracer to copy the intricate design onto her canvas. "devicetechnologymachineChat with AIVocabulary GamePractice Reading
