almucantar staff

noun

: an ancient instrument having an arc of 15 degrees and used at sea to take observations of the sun's amplitude and to find the variation of the compass

Word History

First Known Use

circa 1706, 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