Cryptic crossword clue
Physicist about to introduce minute lozenge 5

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

I've seen this crossword clue in Financial Times
R
H
O
M
B


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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does RHOMB mean?

RHOMB noun
  1. A rhombus.
  2. A rhombohedron.

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