noun
a curve that can be described by a sine or cosine function, typically having a regularly repeating pattern
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The sinusoid function can be represented as y = A sin(Bx + C) + D.
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The graph of a sinusoid looks like a wave.
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I can't wrap my head around this whole sinusoid thing.
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Her voice had a sinusoidal quality, rising and falling in a smooth, rhythmic pattern.