PTS Pali-English dictionary - The Pali Text Society's Pali-English dictionary
Ruka
Ruka,in cpd.aḍḍha° at Vin.II,134,referring to the shape of a beard,is doubtful.The v.l.is “duka.” Could it correspond to Vedic rukma (a certain ornament worn on the chest)? (Page 571)