Where does “Poissonian” come from?

Poissonian (English) comes from English poisson, from French Poisson, from Middle French poisson, from Old French poisson, from Old French peis, from Vulgar Latin pesum, from Latin pēnsum, from Latin pendō — to stretch.

Poissonian (English): Of or pertaining to the Poisson distribution; A...

Definitions

  1. Of or pertaining to the Poisson distribution; A...

Ancestry of “Poissonian”, step by step

Poissonian traces back through two separate lines of ancestry.

via English poisson

StepLanguageWordMeaning
1EnglishpoissonThe Poisson distribution
2FrenchPoissonfish marine animal
3Middle Frenchpoissonfish
4Old Frenchpoissonfish
5Old FrenchpeisAlternative form of pais; Alternative form of...
6Vulgar Latinpesum
7Latinpēnsumallotment, portion, weight (of wool measured out to a slave to spin in a day)
8Latinpendōto weigh, weigh out
9Proto-Italicpendōhang, put in a hanging position
10Proto-Indo-European(s)péndeti
11Proto-Indo-European(s)pend-to stretch

via English ian

StepLanguageWordMeaning
1Englishian
2IrishEoinJohn any of several people in the Bible
3Old IrishIohainJohn apostle
4LatinIōannēsJohn biblical persons
5Ancient GreekἸωάννης
6HebrewיוחנןYahweh is gracious
7Hebrewחנוןgracious, merciful, compassionate; passive...
8Moroccan Arabicخنونةmucus, snot
9Arabicخُنَّة
Every word from Proto-Indo-European (s)pend-