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The Collaborative International Dictionary
killifish

Minnow \Min"now\, n. [OE. menow, cf. AS. myne; also OE. menuse, OF. menuise small fish; akin to E. minish, minute.] [Written also minow.]

  1. (Zo["o]l.) A small European fresh-water cyprinoid fish ( Phoxinus l[ae]vis, formerly Leuciscus phoxinus); sometimes applied also to the young of larger kinds; -- called also minim and minny. The name is also applied to several allied American species, of the genera Phoxinus, Notropis, or Minnilus, and Rhinichthys.

  2. (Zo["o]l.) Any of numerous small American cyprinodont fishes of the genus Fundulus, and related genera. They live both in fresh and in salt water. Called also killifish, minny, and mummichog.

Wiktionary
killifish

n. Any of a number of tiny fish in the Cyprinodontiformes order of ray-finned fish.

WordNet
killifish
  1. n. small mostly marine warm-water carp-like schooling fishes; used as bait or aquarium fishes or in mosquito control

  2. [also: killifishes (pl)]

Wikipedia
Killifish

A killifish is any of various oviparous (egg-laying) cyprinodontiform fish (including families Aplocheilidae, Cyprinodontidae, Fundulidae, Nothobranchiidae, Profundulidae, Rivulidae and Valenciidae). Altogether, there are some 1270 different species of killifish, the biggest family being Rivulidae, containing more than 320 species. Although killifish is sometimes used as an English equivalent to Cyprinodontidae, some species belonging to that family have their own common names, such as the pupfish and the mummichog. The origin of the name is not certain, but is likely to have come from the Dutch for a kill. Because of living in ephemeral waters, the eggs of most killifish can survive periods of partial dehydration. Many of the species rely on such a diapause, since the eggs would not survive more than a few weeks if entirely submerged in water. Like seeds, the eggs can be sent by mail without water. The adults of some species, such as Kryptolebias marmoratus, can additionally survive out of the water for several weeks. Most killies are small fish, from one to two inches (2.5 to 5 cm), with the largest species growing to just under six inches (15 cm).