n. Something growing, usually abnormally, out of something else.
n. A sound in a word without etymological reason.
the GNU version of the Collaborative International Dictionary of English
adj. Growing out in an abnormal or morbid manner or as a superfluity.
The Century Dictionary and Cyclopedia
Growing out of something else; specifically, abnormally put forth or added; hence, superfluous and incongruous: as, a wart is an excrescent growth on the hand; excrescent knots on a tree; excrescent ornaments on a dress or on a building.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. forming an outgrowth (usually an excessive outgrowth)
Word Usage
"Scot actively engaged in parochial work, had his attention fixed upon the reckless improvidence of the 'excrescent' population, and welcomed"