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spectroheliograph

[spek-troh-hee-lee-uh-graf, -grahf]
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noun
  1. an apparatus for making photographs of the sun with a monochromatic light to show the details of the sun's surface and surroundings as they would appear if the sun emitted only that light.

Origin of spectroheliograph

First recorded in 1890–95; spectro- + heliograph
Related formsspec·tro·he·li·o·graph·ic [spek-troh-hee-lee-uh-graf-ik] /ˌspɛk troʊˌhi li əˈgræf ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for spectroheliograph

Historical Examples

  • In the subterranean chamber is the spectroheliograph of exceptional size and power.

    Astronomy

    David Todd

  • He moved to the spectroheliograph, where the zed-ray connections were still humming.


British Dictionary definitions for spectroheliograph

spectroheliograph

noun
  1. an instrument used to obtain an image of the sun in light of a particular wavelength, such as calcium or hydrogen, to show the distribution of the element over the surface and in the solar atmosphere. The image obtained is a spectroheliogram
Derived Formsspectroheliographic, adjective

Word Origin

C19: from spectro- + helio- + -graph
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012