Etymology

spectroheliograph

Today it means: an instrument that produced monochromatic photographs of the sun using light at a selected wavelength Full definition →

English heliograph ← Latin spectrum
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The story

  1. Latinspeciō
  2. Latinspectrum
  3. Englishspectrum
  4. Englishspectro-
  5. Englishheliograph
  6. English todayspectroheliograph

From spectro- + heliograph.

Etymology from Wiktionary, CC BY-SA 4.0.