The Collaborative International Dictionary of English v.0.48:
Vaulter \Vault"er\, n. One who vaults; a leaper; a tumbler. --B. Jonson. [1913 Webster]WordNet (r) 3.0 (2006):
vaulter n 1: an athlete who jumps over a high crossbar with the aid of a long pole [syn: vaulter, pole vaulter, pole jumper]