An abbreviation or shortened form sometimes used in geology or mineralogy, though its precise meaning varies by context.
Likely an abbreviation of diameter or diamond in specialized technical contexts. Uncommonly used in modern scientific writing, which prefers full terms or standard abbreviations.
Scientific abbreviations like 'diam' are dying out as modern scientific papers demand clarity—back in the day, scientists would abbreviate to save space in print, but today's digital world means we can just spell things out.
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