masculine
Aruka = aru; only in compound °ūpamacitto (adjective) having a heart like a sore (of a man in anger) A I 124 = Pp 30 (explained at Pp-a 212 as purāṇa-vaṇa-sadisa-citto "an old wound" i.e. continually breaking open).
a sore
(masc, masc, in comps, from aru) wound; sore Construction: aru + ka