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From The Collaborative International Dictionary of English v.0.48:
Vadium \Va"di*um\, n. [LL., from L. vas, vadis, bail.] (Law) Pledge; security; bail. See Mortgage. [1913 Webster] Vadium vivum [LL.] (Law), a living pledge, which exists where an estate is granted until a debt is paid out of its proceeds. [1913 Webster]