Where does “pentaprism” come from?

pentaprism (English) comes from English prism, from Late Latin prisma, from Ancient Greek πρίσμα, from Ancient Greek -μᾰ, from Proto-Indo-European -mn̥ — Creates action nouns or result nouns from verbs.

pentaprism (English): A five-sided prism used in the viewfinder of most...

Definitions

  1. A five-sided prism used in the viewfinder of most...

Ancestry of “pentaprism”, step by step

pentaprism traces back through two separate lines of ancestry.

via English prism

StepLanguageWordMeaning
1EnglishprismA polyhedron with parallel ends of the same size...
2Late Latinprismaprism
3Ancient GreekπρίσμαAnything sawn, sawdust; A prism
4Ancient Greek-μᾰ"suffix forming a noun denoting the result of an...
5Proto-Indo-European-mn̥Creates action nouns or result nouns from verbs

via English penta

StepLanguageWordMeaning
1Englishpenta
Every word from Proto-Indo-European -mn̥Every word from Ancient Greek -μᾰEvery word from Ancient Greek πρίσμα