GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
Definition: Yng nghyd-destun rasio milgwn, gwrthrych mecanyddol sy'n aml yn efelychu anifail prae ac a dynnir ar hyd cledren wrth ochr trac er mwyn cymell y milgwn i rasio ar ei ôl.
