fish

n. type of cold-blooded aquatic animal with fins and scales; other aquatic animals (Informal); flesh of fish; fellow, guy (used in combination - i.e. odd fish, queer fish)

v. catch fish; try to catch fish; search for fish; search; try to obtain -

Fish are aquatic vertebrates that are  cold-blooded, covered with scales, and equipped with two sets of paired fins and several unpaired fins. Fish are abundant in the sea and in fresh water, with species being known from mountain streams (e.g., char and gudgeon) as well as in the deepest depths of the ocean (e.g., gulpers and anglerfish). They are of tremendous importance as food for people around the world, either collected from the wild (see fishing) or farmed in much the same way as cattle or chickens (see aquaculture). Fish are also exploited for recreation, through angling and fishkeeping, and fish are commonly exhibited in public aquaria. Fish have an important role in many cultures through the ages, ranging as widely as deities and religious symbols to subjects of books and popular movies.
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Fish are vertebrates with gills that live in water. The word may also apply to the fish as food or to the act of fishing, either commercially or for recreation. The fisheries industry also recognises white fish, oily fish, inkfish, and shellfish, though these are not taxonomic groups. A variety of animals that are not actually fish have the word as part of their name for etymological or commercial reasons, such as shellfish, jellyfish, cuttlefish, crawfish, and crayfish.
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Noun
1. (astrology) a person who is born while the sun is in Pisces
(synonym) Pisces
(hypernym) person, individual, someone, somebody, mortal, human, soul
(classification) astrology, star divination
2. the twelfth sign of the zodiac; the sun is in this sign from about February 19 to March 20
(synonym) Pisces, Pisces the Fishes
(hypernym) sign of the zodiac, star sign, sign, mansion, house, planetary house

Noun
1. any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills; "the shark is a large fish"; "in the livingroom there was a tank of colorful fish"
(hypernym) aquatic vertebrate
(hyponym) bottom feeder
(member-holonym) school, shoal
(part-meronym) fish scale
2. the flesh of fish used as food; "in Japan most fish is eaten raw"; "after the scare about foot-and-mouth disease a lot of people started eating fish instead of meat"; "they have a chef who specializes in fish"
(hypernym) food
(hyponym) panfish
Verb
1. seek indirectly; "fish for compliments"
(synonym) angle
(hypernym) search, seek, look for
2. catch or try to catch fish or shellfish; "I like to go fishing on weekends"
(hypernym) catch, grab, take hold of
(hyponym) crab

(pl. )
of Crayfish
  

Abbreviation for fluorescence in situ hybridization, a molecular approach to chromosome mapping. FISH uses fluorescein tags that glow to detect the hybridization (the combination) of probes with chromosomes.