Definition of "excrescency"

excrescency

noun
plural excrescencies
1. An excrescent state or condition; the quality or fact of growing out of something; abnormal or excessive development
2. (obsolete) An exuberant outburst; an extravagance.
3. (obsolete) An excrescence, and excrescent growth; an outgrowth.
  Quotations
  And having enquir'd into the History of Cork, I find it reckoned as an excrescency of the bark of a certain Tree […].
  1665, Robert Hooke, Micrographia, section XVIII
4. (obsolete) An abnormal, morbid, or unsightly outgrowth.