carbon 12

C c

Definition of carbon 12 words

noun carbon 12 the isotopic carbon atom that comprises 99 percent of naturally occurring carbon, and that since 1961 has been used as the standard for atomic weight by representing a unit of 12.00000. 1

before 1940

One of the 7% newest English words

First recorded in 1940-45

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exclamation

A common word. It’s meaning is known to most children of preschool age. About 86% of English native speakers know the meaning and use the word.

This word is included in each student's vocabulary. Most likely there is at least one movie with this word in the title.

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