surplu

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
SURPLUS. That which is left from a fund which has been appropriated for a 
particular purpose; the remainder of a thing; the overplus the residue. 
(q.v.) See 18 Ves. 466. 
     2. The following is an example of a surplus; if a thing be put in 
pledge as a security to pay one hundred dollars, and it be afterwards sold 
for one hundred and fifty dollars, the fifty dollars will be the surplus. 
Wolff, Inst. Sec. 697. See Overplus; Residue. 
    

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