The Collaborative International Dictionary of English v.0.48:
Bullace \Bul"lace\, n. [OE. bolas, bolace, OF. beloce; of Celtic origin; cf. Arm. bolos, polos, Gael. bulaistear.] (Bot.) (a) A small European plum (Prunus communis, var. insitita). See Plum. (b) The bully tree. [1913 Webster]WordNet (r) 3.0 (2006):
bullace n 1: small wild or half-domesticated Eurasian plum bearing small ovoid fruit in clusters [syn: bullace, Prunus insititia]