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What is the correct way of pluralizing acronyms in which the last word is either irregular or a foreign word?

For example: radiation transparent medium (RTM)

What would be the plural of the acronym RTM?
RTMs or RTM considering that the plural of medium is media?

borondics
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  • @Laurel Well found. I was wallowing. – Edwin Ashworth May 09 '20 at 18:34
  • Please note thet RTM is not generally (on ELU or elsewhere) seen as being an acronym (as the letters are enunciated separately) but as an initialism. NATO and radar are seen as acronyms. Check in various dictionaries. However, pluralisation rules are virtually identical. Treat as a new unit: RTMs. – Edwin Ashworth May 09 '20 at 18:38

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