periodograph
/ˌpɪərɪˈɒdəɡrɑːf/ /ˌpɪərɪˈɒdəɡraf/Chiefly Science
noun
1A periodogram; (originally) specifically a curve drawn in a periodogram. Now disused.
2An instrument for automatically making a periodogram analysis or Fourier analysis of a curve by optical means.
Origin
Late 19th century. From period + -o- + -graph. Compare slightly earlier periodogram.
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