Cryptic crossword clue
Main variable describing an alloy 5

The most common and most likely answer to this crossword clue is the 5 letter word INVAR

I
N
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More clues leading to the result INVAR

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The cryptic/wordplay part
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What does INVAR mean?

INVAR noun
  1. An alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion.

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