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The Collaborative International Dictionary of English v.0.48 (gcide)

Stylus \Sty"lus\, n. [L. stylus, or better stilus.]
1. An instrument for writing. See {Style}, n., 1.
[1913 Webster]

2. That needle-shaped part at the tip of the playing arm of
phonograph which sits in the groove of a phonograph record
while it is turning, to detect the undulations in the
phonograph groove and convert them into vibrations which
are transmitted to a system (since 1920 electronic) which
converts the signal into sound; also called {needle}. The
stylus is frequently composed of a hard metal or of
diamond.
[PJC]

3. The needle-like device used to cut the grooves which
record the sound on the original disc during recording of
a phonograph record; it is moved by the vibrations given
to the diaphragm by a sound, and produces the indented
record.
[PJC]

4. (Computers) A pen-shaped pointing device used to specify
the cursor position on a graphics tablet.
[PJC] Stymie