Plural of "Refractive Index": Debate

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The correct plural of "refractive index" is "refractive indices," which is accepted in both American and Canadian English. Some participants in the discussion mistakenly suggested "refractive indicies" and "refractive indexes," but these forms are incorrect. The debate highlights the importance of precise spelling in academic writing. Variations may exist in different English dialects, but "indices" is the standard term. Accurate terminology is crucial in scientific contexts.
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Homework Statement



So I'm starting to write a lab report but I've hit a boundary in that I have inflicting opinions on what the plural of 'refractive index' is. I have some people saying 'refractive indices' and others saying 'refractive indicies' and a few people saying 'refractive indexes'. I'm pretty sure it's not the latter but i have no idea which of the first two. Spelling really does matter in this thing.

Thanks in advance
 
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tomeatworld said:

Homework Statement



So I'm starting to write a lab report but I've hit a boundary in that I have inflicting opinions on what the plural of 'refractive index' is. I have some people saying 'refractive indices' and others saying 'refractive indicies' and a few people saying 'refractive indexes'. I'm pretty sure it's not the latter but i have no idea which of the first two. Spelling really does matter in this thing.

Thanks in advance

It's index - indices (in American and Canadian)
It may vary in different versions of English.
And by the way, it's actually "grammar".
 
hahahaha. Oh the irony. Thanks a lot for the answer!
 

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