Etymology

polytree

P3O1L1Y4T1R1E1E1

Today it means: a graph with at most one undirected path between any two vertices. In other words, a directed acyclic graph (DAG) for which there are no undirected cycles either. Full definition →

English tree ← Middle English tre ← Old English trēow
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The story

  1. Proto-Indo-European*pleh₁-
  2. Proto-Indo-European*polh₁ús
  3. Ancient Greekπολῠ́ς (polŭ́s)
  4. Englishpoly-
  5. Proto-Indo-European*dóru
  6. Proto-Germanic*trewą
  7. Proto-West Germanic*treu
  8. Old Englishtrēow
  9. Middle Englishtre
  10. Englishtree
  11. English todaypolytree

From poly- + tree.

Etymology from Wiktionary, CC BY-SA 4.0.