gill

n. breathing organ of fish and other aquatic animals; unit of capacity equal to one fourth of a pint (1.183 deciliters)

v. clean a fish

A gill is a respiration organ that functions for the extraction of oxygen from water and the excretion of carbon dioxide. Unlike many small aquatic animals, which can absorb oxygen through the entire surface of their bodies, more complex aquatic organisms have gills specially formed to present an adequate surface area to the external environment. Gills are usually thin plates of tissue, branches, or slender tufted processes and, with the exception of some aquatic insects, they contain blood or coelomic fluid, which exchanges gases through their thin walls. Oxygen is carried by the blood to other parts of the body. Carbon dioxide passes from the blood through the thin gill tissue into the water. Gills or gill-like organs, located in different parts of the body, are found in various groups of animalia. These include mollusks, crustaceans, insects, fish, and amphibians.
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n. gill, breathing organ of fish and other aquatic animals (1.183 deciliters)

(n.)
The radiating, gill-shaped plates forming the under surface of a mushroom.
  

(n.)
The ground ivy (Nepeta Glechoma); -- called also gill over the ground, and other like names.
  

(n.)
The fleshy flap that hangs below the beak of a fowl; a wattle.
  

(n.)
The flesh under or about the chin.
  

(n.)
One of the combs of closely ranged steel pins which divide the ribbons of flax fiber or wool into fewer parallel filaments.
  

(n.)
Malt liquor medicated with ground ivy.
  

(n.)
An organ for aquatic respiration; a branchia.
  

(n.)
A young woman; a sweetheart; a flirting or wanton girl.
  

(n.)
A woody glen; a narrow valley containing a stream.
  

(n.)
A two-wheeled frame for transporting timber.
  

(n.)
A measure of capacity, containing one fourth of a pint.
  

(n.)
A leech.
  

Noun
1. a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters
(hypernym) British capacity unit, Imperial capacity unit
(part-holonym) pint
(part-meronym) fluidounce, fluid ounce
2. a United States liquid unit equal to 4 fluid ounces
(hypernym) United States liquid unit
(part-holonym) cup
(part-meronym) fluidounce, fluid ounce
3. any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus
(synonym) lamella
(hypernym) plant organ
4. respiratory organ of aquatic animals that breathe oxygen dissolved in water
(synonym) branchia
(hypernym) respiratory organ
(hyponym) ctenidium