PTS Pali-English dictionary - The Pali Text Society's Pali-English dictionary
Ratani
Ratani,[Sk.aratni “elbow” with apocope and diaeresis; given at Halāyudha 2,381 as “a cubit,or measure from the elbow to the tip of the little finger.” The form ratni also occurs in Sk.The etym.is fr.Idg.*ole (to bend),cp.Av.ar∂pna elbow; Sk.arāla bent; of which enlarged bases *olen in Lat.ulna,ond *oleq in Lat.lacertus,Sk.lakutaḥ=P.laguḷa.See cognates in Walde,Lat.Wtb.s.v.lacertus] a cubit Miln.85 (aṭṭha rataniyo).(Page 563)