positive caster

noun Automotive.
See under caster ( def 6 ).
Dictionary.com Unabridged

caster

[kas-ter, kah-ster]
noun Also, castor (for defs 2–5).
1.
a person or thing that casts.
2.
a small wheel on a swivel, set under a piece of furniture, a machine, etc., to facilitate moving it.
3.
a bottle or cruet for holding a condiment.
4.
a stand containing a set of such bottles.
5.
a metal container for sugar, pepper, etc., having a perforated top to permit sprinkling; dredger; muffineer.
6.
Automotive. the angle that the kingpin makes with the vertical. Automobiles are usually designed with the upper end of the kingpin inclined rearward (positive caster) for improved directional stability.
verb (used without object)
7.
(of a wheel) to swivel freely in a horizontal plane.

Origin:
1300–50; Middle English; see cast, -er1

casterless, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
caster (ˈkɑːstə)
 
n
1.  a person or thing that casts
2.  Also: castor a bottle with a perforated top for sprinkling sugar, etc, or a stand containing such bottles
3.  Also: castor a small wheel mounted on a swivel so that the wheel tends to turn into its plane of rotation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

caster
"pepper shaker," 1676, on notion of "throwing;" meaning "wheel and swivel attached to furniture" is from 1748, from cast (q.v.) in the old sense of "turn."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If the caster is different from side to side, the vehicle will pull to the side with the less positive caster.
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