Etymology

defocus

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Today it means: To cause (a lens, or a beam of light or particles, etc.) to be out of focus. Full definition →

English focus ← Latin dē- ← Proto-Italic *dē
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The story

  1. Proto-Indo-European*de
  2. Proto-Indo-European*déh₁
  3. Proto-Italic*dē
  4. Latindē
  5. Latindē-
  6. Englishde-
  7. Englishfocus
  8. English todaydefocus

From de- + focus.

Etymology from Wiktionary, CC BY-SA 4.0.