Definition of Percusion
Per*cus"sion (?), n. [L.
percussio: cf. F. percussion. See Percuss.]
1. The act of percussing, or striking one body
against another; forcible collision, esp. such as gives a sound or
report. Sir I. Newton.
2. Hence: The effect of violent collision;
vibratory shock; impression of sound on the ear.
The thunderlike percussion of thy
sounds. Shak.
3. (Med.) The act of tapping or
striking the surface of the body in order to learn the condition of
the parts beneath by the sound emitted or the sensation imparted to
the fingers. Percussion is said to be immediate if the blow is
directly upon the body; if some interventing substance, as a
pleximeter, is, used, it is called mediate.
Center of percussion. See under
Center. -- Percussion bullet, a
bullet containing a substance which is exploded by percussion; an
explosive bullet. -- Percussion cap, a
small copper cap or cup, containing fulminating powder, and used with
a percussion lock to explode gunpowder. -- Percussion
fuze. See under Fuze. -- Percussion
lock, the lock of a gun that is fired by percussion upon
fulminating powder. -- Percussion match, a
match which ignites by percussion. -- Percussion
powder, powder so composed as to ignite by slight
percussion; fulminating powder. -- Percussion
sieve, Percussion table, a machine for
sorting ores by agitation in running water.
- Webster's Unabridged Dictionary (1913)
- the collision of two bodies in order to produce a sound
- the sound so produced
- the detonation of a percussion cap in a firearm
- the tapping of the body as an aid to medical diagnosis
- the section of an orchestra containing percussion instruments; such instruments considered as a group
- The Nuttall Encyclopedia
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