Also called vertical stabilizer. Aeronautics. any of certain small, subsidiary structures on an aircraft, designed to increase directional stability.
any of a number of standing ridges on an ordinarily hot object, as a radiator, a cylinder of an internal-combustion engine, etc., intended to maximize heat transfer to the surrounding air by exposing a large surface area.
any part, as of a mechanism, resembling a fin.
Metallurgy. a ridge of metal squeezed through the opening between two rolls, dies, or halves of a mold in which a piece is being formed under pressure.
The grain carriers will gain additional efficiencies from a unique propulsion system that puts its fins ahead of the propellers.
Nerves based in the fish's brain instruct its fins to move, and off it goes.
Formal taxonomic systems first identified species based on visual traits such as fins or fur.
To increase the efficiency of this process, the top of the heat pipe can be fitted with fins that help remove the heat.
The animals are sought for their fins, which are a delicacy in soup.
The fish showed discoloration in the form of depigmentation and the beginnings of deformation of fins.
It might cool your head, but if it means carrying a backpack of batteries and aluminum fins on your head.
Fish studies the movement of the tail and its two side fins, known as flukes.
Optimistic drivers of the past imagined a future in which the stubby tail fins of their cars morphed into broad wings.
They tend to be bigger than other females, and they have fancier fins and brighter color patterns.
British Dictionary definitions for fins
any of the firm appendages that are the organs of locomotion and balance in fishes and some other aquatic animals. Most fishes have paired and unpaired fins, the former corresponding to the limbs of higher vertebrates
a part or appendage that resembles a fin
(Brit) a vertical surface to which the rudder is attached, usually placed at the rear of an aeroplane to give stability about the vertical axis US name vertical stabilizer
a tail surface fixed to a rocket or missile to give stability
(nautical) a fixed or adjustable blade projecting under water from the hull of a vessel to give it stability or control
a projecting rib to dissipate heat from the surface of an engine cylinder, motor casing, or radiator
O.E. fin, from P.Gmc. *finno (cf. M.L.G. vinne, Du. vin), perhaps from L. pinna "feather, wing," or, less likely, from L. spina "thorn, spine" (see spike (n.1)). U.S. underworld slang sense of "$5 bill" is 1925, from Yiddish finif "five," from Ger. fünf. The same word had been used in England 1868 to mean "five pound note" (earlier finnip, 1839).