leaf node vs outgrowth

leaf node

noun
  • A node, in a tree, that has no children. 

  • One of the spots upon a stem where buds and intercalary meristems occur, usually marking the end of a season's growth. 

outgrowth

noun
  • A branch or offshoot of a plant. 

  • An appendage of an animal. 

  • Excessive growth. 

  • A byproduct or consequence of an action or event. 

How often have the words leaf node and outgrowth occurred in a corpus of books? (source: Google Ngram Viewer )