Etymology

eighteenmo

E1I1G2H4T1E1E1N1M3O1

Today it means: octodecimo (as a paper size in printing). Full definition →

English eighteen ← Middle English eightetene ← Anglian Old English eahtatēne
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The story

  1. Proto-Indo-European*oḱtṓw
  2. Proto-Germanic*ahtōu
  3. Proto-Indo-European*déḱm̥
  4. Proto-Germanic*tehun
  5. Proto-Germanic*ahtōutehun
  6. Anglian Old Englisheahtatēne
  7. Middle Englisheightetene
  8. Englisheighteen
  9. English todayeighteenmo

From eighteen + -mo.

Etymology from Wiktionary, CC BY-SA 4.0.