From The Collaborative International Dictionary of English v.0.48:
Mammon \Mam"mon\ (m[a^]m"m[u^]n), n. [L. mammona, Gr. mammwna^s
riches, Syr. mam[=o]n[=a]; cf. Heb. matm[=o]n a hiding place,
subterranean storehouse, treasury, fr. t[=a]man to hide.]
Riches; wealth; the god of riches; riches, personified.
[1913 Webster]
Ye can not serve God and Mammon. --Matt. vi.
24.
[1913 Webster]