Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small Japanese fish (Oryzias latipes) commonly found in rice fields and often used in biological research or in stocking aquariums.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small Japanese ricefish, popular for use in aquariums.

Etymologies

Japanese, killifish : me, eye + daka, high.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Japanese メダカ. (Wiktionary)

Examples

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  • It's a fish of the rice paddies in Japan.

    January 2, 2012