SaMbUkaH 1 A bivalve shell ( SaMbUkA also in this sense). 2 A small conch-shell. 3 A snail. 4 The edge of the frontal protuberance of an elephant. 5 N. of a Śūdra (who practised penance though forbidden to his caste and was in consequence slain by Rāma; see inter alia U. 2. and R. 15 ).