prism

The story

1. Ancient Greekπρῑ́ω (prī́ō)
2. Ancient Greekπρίσμᾰ (prísmă)
3. Late Latinprisma
4. English todayprism

Learned borrowing from Late Latin prisma (“(geometry) prism”), from Ancient Greek πρίσμᾰ (prísmă, “anything sawn; sawdust; (Koine, geometry) prism”), from πρῐ́ζω (prĭ́zō) (a variant of πρῑ́ω (prī́ō, “to saw”), further etymology unknown) + -μᾰ (-mă, suffix forming neuter nouns denoting the effect or result of an action, etc.).