yearning

noun2

1. •
   A wistful or melancholy longing.

   • She had a yearning to see her long-lost sister again.
2. •
   (Scotland, no longer used) Rennet (an enzyme to curdle milk in order to make cheese).

   • Mrs. MacClarty then took down a bottle of rennet, or yearning, as she called it. — 1808