Definition of sinusoid in English:

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Pronunciation: /ˈsʌɪnəsɔɪd/


1 another term for sine curve.
Example sentences
  • The Fourier transform decomposes or separates a waveform or function into sinusoids of different frequency which sum to the original waveform.
  • Most transient signals, which are exponentially damped sinusoids, cannot be wavelet basis functions because of their nonzero mean.
  • A digital tone generator produced a pure tone sinusoid, and the intensity envelope was visually adjusted to fit the envelope of a representative call of the population.
2 Anatomy A small irregularly shaped blood vessel found in certain organs, especially the liver.
Example sentences
  • One patient had sickle cell anemia and showed sickled red blood cells in the dilated sinusoids.
  • In the liver, larvae move freely in the sinusoids.
  • Occasionally, the spindle cells invaded the sinusoids, replacing the normal endothelium.



Pronunciation: /sʌɪnəˈsɔɪd(ə)l/
Example sentences
  • Many standard curves occur as sinusoidal spirals.
  • Visual observations of hair bundle motion showed sinusoidal or nearly sinusoidal motion.
  • If you're not familiar with the Fourier transform, its purpose is to decompose a function into sinusoidal basis functions.


Pronunciation: /sʌɪnəˈsɔɪd(ə)li/
Example sentences
  • Modulating the current density periodically with a pseudo-sine wave generates the sinusoidally varying porosity gradient that creates the rugate filter.
  • Seven subjects walked on a programmable treadmill both at constant and oscillating speeds, set to sinusoidally change between the two limits in 3 seconds.
  • The light can be pulsed, sinusoidally modulated, or unmodulated, depending on the requirements for speed, cost, and resolution.


Early 19th century: from French sinusoïde, from Latin sinus (see sinus).

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