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: Dyfais fechan sy'n galluogi cyfathrebu diwifr rhwng dwy ddyfais sy'n agos at ei gilydd, ee microsglodyn mewn cerdyn banc sy'n cyfathrebu รข dyfais dalu.
Notes: Term sy'n codi ym maes triniaethau arbennig (tyllu'r croen).
