cymatograph

/saɪˈmætəʊɡɹɑːf/

Etymology

From Latin cȳmat(is) (“sprout, swelling, hollow sphere”) + -o- + -graph, stem of cȳma, from Ancient Greek κῡ́μᾰτος (kū́mătos, “wave, billow, swell, sprout, fetus”), genitive of κῦμα (kûma). Compare cymograph.

noun

  1. An instrument for compounding the resultant of two parallel, simple, harmonic waves.“Prof. S. P. Thompson…had also lent for exhibition…a “cymatograph” (an instrument for compounding the resultant of two parallel, simple, harmonic waves).”