The story
- Proto-Indo-European*per-
- Ancient Greekπερῐ́ (perĭ́)
- Englishperi-
- Proto-Indo-European*(s)peys-der.?
- Latinspīrō
- Latinspīritu
- Old Frenchespirit
- Middle Englishspirit
- Englishspirit
- English todayperispirit
From peri- + spirit. In Allan Kardec's 1857 book The Spirits Book (Le Livre des Esprits in original French), the term is defined with a direct analogy to perisperm (“layer of nutritive tissue that surrounds the embryo of a seed in some angiosperms”).
Etymology from Wiktionary, CC BY-SA 4.0.