aktograph

noun

ak·​to·​graph

ˈak-tə-ˌgraf

plural -s

: a device for recording the movements of a caged but not restrained experimental animal

Word History

Etymology

German, from Latin actus (past participle of agere to do, drive) + German -graph

First Known Use

1915, 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