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Answer for the clue "A radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction ", 5 letters:
label

Alternative clues for the word label

Word definitions for label in dictionaries

Wikipedia Word definitions in Wikipedia
In philately , label or coupon or tab is a part of sheet of stamps separated from them with perforation (or narrow white margin in imperforate stamps ). It cannot be used for postage because it does not have face value and any indication of a postal administration ...

Wiktionary Word definitions in Wiktionary
n. 1 A small ticket or sign giving information about something to which it is attached or intended to be attached. 2 A name given to something or someone to categorise them as part of a particular social group. 3 A company that sells records. 4 (context ...

Usage examples of label.

The box bearing the aconitine label and the pills had all rolled out of the china umbrella stand, and he had taken it for granted that the pills belonged in the box.

Rabbi Solomon ben Adret of Barcelona issued a document labeling Abulafia a dangerous charlatan.

Show me where the label for the aerosol version is different from the label for the pills.

Hardfaced men--the agitators who had been prominent in the trouble from the first--mounted soap boxes at street corners, and began to label Aunt Nora as a sinister woman, and Doc Savage a murderer and worse.

GREATEST ASSET, AND THEY BEGAN recording their first album for their own label not long after the record division was set up.

For a while there was some robust debating, the Castellans being pilloried as dictatorial and even war-mongering, while the Ploughers were labelled as naive appeasers and cowards and quite indifferent to the fate of the people who worked in the forestry trade.

They had no curiosity as to why they were taking the labels off the filled cans of azote fruits, or what was at the other end of the moving belt that brought the cans through the wall.

Therewere always loose backs to be fastened on securely, notes to be erased from margins, pages to be mended, labels to belettered and affixed.

He lifted the name of the heroine, Bema, from the label of a can of condensed milk.

The difficulties created by the Burr case have been obviated to a considerable extent through the punishment of acts ordinarily treasonable in nature under a different label within a formula provided by Chief Justice Marshall himself in the Bollman case.

They could see it was not far away, labeled simply Boojum in red, underlined twice.

Moreover, he was able to describe the markings of the Bott violin even to the label inside it.

These varieties of salad dressings are pretty reliably low-carb, but read the labels to find the brand with the lowest carb count.

Still, both because of the possibility of more carb absorption than the labels let on and because of possible gastric distress, go easy, okay?

The rest of the ingredients were in the pantry, in neatly labelled pots and sacks: the same roots and barks used in cookery, most of them.