Etymology

femtometer

F4E1M3T1O1M3E1T1E1R1
English meter ← Danish femten ← Old Norse fimmtán
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The story

  1. Proto-Indo-European*pénkʷe
  2. Proto-Germanic*fimf
  3. Proto-Indo-European*déḱm̥
  4. Proto-Germanic*tehun
  5. Proto-Germanic*fimftehun
  6. Old Norsefimmtán
  7. Danishfemten
  8. Englishfemto-
  9. Englishmeter
  10. English todayfemtometer

From femto- + meter.

Etymology from Wiktionary, CC BY-SA 4.0.