an equal-area map projection on which all parallels are straight lines and all except the prime meridian are sine curves, often used to show tropical latitudes
WordReference Random House Unabridged Dictionary of American English © 2025
sinusoi′dal projec′tion, [Cartog.]
- Geographyan equal-area projection in which parallels are straight lines spaced at regular intervals, the central meridian is a straight line one-half the length of the equator, and the other meridians are curves symmetrical to the central meridian.
- 1940–45
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