Directed graph showing the descent of the English word "extracurricular" from Proto-Indo-Euorpean *h₁eǵʰ-: "out", *-teros: derives contrastive adjectives, *ḱers-: "to run", *tlom derives instrumental nouns, and possibly h₂el-: "to grow, to nourish"
Apparently today is #BigWordDay
The longest English word in my dataset (with no spaces or hyphens) is "extracurricular"
(All yours, big guy.)