Webster's English Dictionary

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superfluous

su.per.flu.ous \su.-'p*r-fl*-w*s\ aj [ME, fr. L superfluus, lit., running 
   over, fr. superfluere to overf]low, fr. super- + fluere to flow - more at 
   FLUID 1: exceeding what is sufficient or necessary : EXTRA  obs  2: 
   WASTEFUL, EXTRAVAGANT  - su.per.flu.ous.ly av