Also found in: Dictionary, Thesaurus, Medical, Financial, Wikipedia.
Related to Sinusoid: sinusitis, sine wave


Any of the relatively large spaces comprising part of the venous circulation in certain organs, such as the liver.



(or sine curve), the graph of the function y = sin x. It is a plane curve (see Figure 1) representing the variation in the sine as the argument, or angle, changes. A sinusoid intersects the x-axis at the points 180°k (or πk) and has maxima at the points 90° + 360°k (or π/2 + 2-πk) and minima at the points - 90° + 360°k (or - π/2 + 2πk), where k = 0, ± 1.....

Figure 1

The curve defined by the equation y = A sin (ωx + Φ0) is also sometimes called a sinusoid. The relation between this curve and the curve y = sin x is as follows: first, the x-coordinates of the points of y = sin x are increased by a factor of ω; second, the y-coordinates of the points of y = sin x are increased by a factor of A; and third, the curve is translated by an amount - Φ0/ω along the x-axis. The number A is called the amplitude, ω is called the angular frequency, and Φ/0 is called the initial phase angle. The sinusoid is of great importance in the theory of oscillations. [23–1296–]

References in periodicals archive ?
In this study, we also found that the wall of the hepatic sinusoid consists of one layer of endothelial cells that was not continuous.
They reside in the liver sinusoids and provide the first line of defense, serving as potent innate immune cells.
Upon selection of STFT, the next step is to select an appropriate window size as [39], where two closest sinusoids can be distinguished using (7).
b) With sinusoid signals, 20 dB/decade frequency roll-off had been observed at 3.
The terrain surface model was created such that sinusoids of the right and left boards of the rover were counterphase to each other and had small difference in the period.
For its resolution, modified version of analogue PSD uses analogue multiplier instead of switching amplifier with thereference signal being a sinusoid instead of square-wave.
The inner microrelief was smoothened due to the paralytic expansion of arterioles and venules; however numerous micropinocytotic vesicles appeared on the surface of capillaries which belonged to the sinusoid type.
Microstructured silicone tubing allows PTFE to pass completely through; the PTFE tube is completely inside the microstructured silicone tubing in the middle sinusoid.
Resolute Integrity DES, the innovative technology used, combines the powerful clinical advantages of Resolute DES with the groundbreaking continuous sinusoid technology (CST) that encompasses one continuous, single strand of wire, making each stent comparable to a flexible spring.