An alternative spelling of excrescence; an abnormal or unwanted outgrowth.
A variant spelling of excrescence (with one 's' instead of two), from Latin excrescentia; this spelling variant appears in older texts but is now considered non-standard.
This spelling shows how even older English texts weren't always consistent—two different people writing in the 1600s might spell the same word differently, which is why we see 'excresence' in old medical books.
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