Source : Webster's Revised Unabridged Dictionary (1913)

Outgrowth \Out"growth`\, n.
   That which grows out of, or proceeds from, anything; an
   excrescence; an offshoot; hence, a result or consequence.

Source : WordNet®

outgrowth
     n 1: a natural consequence of development [syn: {branch}, {offshoot},
           {offset}]
     2: the gradual beginning or coming forth; "figurines presage
        the emergence of sculpture in Greece" [syn: {emergence}, {growth}]
     3: a natural prolongation or projection from a part of an
        organism either animal or plant; "a bony process" [syn: {process},
         {appendage}]