magnetotail

noun

mag·​ne·​to·​tail

"+

: the region of the magnetosphere of a celestial body (such as a planet) that is swept back by the solar wind in the direction away from the sun

Word History

Etymology

magnet- + tail

First Known Use

1968, in the meaning defined above

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now