These are the comments on (Deleted 2022-10-09 20:51:08)'s contribution “Meiniast”.
SindarinMeiniast
noun. firstfruits
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Assuming you mean this sense of the word, it’s probably in some way it from mein “first” and √YAB, but I don’t understand the process by which -st arises, so I would ask you to detail your derivation.
gilruin · Gilruin
The -st derives from the fan-adapted Sindarin word iaust. It was considered whether the -st would be the most correct, though I am unsure if it is.
Ah, I forgot about that word. I don't like it particularly but I suppose it's fine. However AU in polysyllabic words changes to O, so -iost. A sometimes happens before clusters that shorten long ā, e. g. nār > naur but Nr-winjā > Narwinjā > Narwain, but as the ST didn't block Ā > AU in iaust, it has no reason to do it in a compound.
Also, I'd ask you to add an explanation of the derivation to the entry itself.