A curve or wave that resembles or follows the shape of a cosine function, showing regular oscillating motion.
From cosine + -oid (resembling or shaped like). A mathematical term combining 'cosinus' (Latin for cosine) with the Greek-derived suffix '-oid'.
Sound waves, light waves, and ocean waves all follow cosinusoid patterns—that's why a single cosine function can describe so many completely different phenomena in nature.
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