Plural of "Refractive Index": Debate

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SUMMARY

The correct plural form of "refractive index" is "refractive indices," which is accepted in both American and Canadian English. The alternative "refractive indicies" is incorrect, while "refractive indexes" is also commonly used but less preferred in formal contexts. This discussion emphasizes the importance of precise spelling in academic writing, particularly in lab reports.

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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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