connate vs in the grain

connate

adj
  • Trapped within a rock at the time of its formation (especially of water or petroleum). 

  • United with other organs of the same kind (for example sepals connate with sepals, petals connate with petals, or stamens with stamens). 

  • Of the same or a similar nature; proceeding from the same stock or root. 

  • Inborn. 

in the grain

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