sinusoids

/S AY1 N AH0 S OY0 D Z/
noun
  1. 1

    A curve having the shape of a sine wave.

  2. 2

    Any of several channels through which venous blood passes in various organs.

Source: https://en.wiktionary.org/wiki/sinusoid, https://en.wiktionary.org/wiki/sinusoids