Definition of Trunnion

1. n. A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. See Illust. of Cannon.

Definition of Trunnion

1. Noun. The short stubby bearings on either side of a cannon; a gudgeon ¹

2. Noun. A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool. ¹

¹ Source:

Definition of Trunnion

1. a pin or pivot on which something can be rotated [n -S]

Medical Definition of Trunnion

1. 1. A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. 2. A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam. Trunnion plate, a ring on a cannon next before the trunnions. Origin: OF. Trognon the stock, stump, or truck of a tree, F. Trognon a core, stalk, fr.tron a trunk, stem. Cf. Trunk. Source: Websters Dictionary (01 Mar 1998)

Trunnion Pictures

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Lexicographical Neighbors of Trunnion

trunks of brachial plexus
trunnion (current term)
truss bridge

Literary usage of Trunnion

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Works of Tobias Smollett by Tobias George Smollett, William Ernest Henley (1899)
"proofs of her regard, that not only the rest of the company, but even trunnion himself, perceived her drift; and taking the alarm accordingly, ..."

2. Tool Engineering: Jigs and Fixtures by Albert Atkins Dowd, Frank W. Curtis (1922)
"When a piece of work is to be drilled from three or four sides it may often be desirable to locate it in some form of indexing or trunnion jig. ..."

3. A Dictionary of Military Terms by Edward Samuel Farrow (1918)
"trunnion-band.—In a built-up gun, the hoop to which the trunnions are ... One is passed under each trunnion and hooked on the head of the screw of the ..."

4. Bridge Engineering by John Alexander Low Waddell (1916)
"An early span of the trunnion type which gave practical service was the ... Another trunnion bascule was the Knippel bridge built at Copenhagen in 1867. ..."

5. A Treatise on the Steam Engine in Its Application to Mines, Mills, Steam by Artizan club (London, England) (1853)
"The curved groove in which the end of the valve lever moves is part of a circle, bat it is not swept from the centre of the trunnion when the valve is at ..."

6. The Encyclopedia Americana: A Library of Universal Knowledge (1918)
"The bascule bridges follow one of three distinct types: (1) The trunnion type—in which the weight of the bridge together with its counterweight is supported ..."

7. Modern Mechanism: Exhibiting the Latest Progress in Machines, Motors, and by D. Appleton and Company (1892)
"The trunnion and intermediate sections are supported from the barrel by radial webs or studs, leaving ample space for the free passage of the fluid from the ..."

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