bestiality

noun6

1. •
   Bestial nature, savagery, inhumanity, like (or akin to) an animal's.
2. •
   Sexual activity between a human and another animal species.

   • Less common, but still frequent, are erect penises, more complete female nudes, copulations, and even scenes of bestiality. — 2018
3. •
   (old-fashioned) Any abstract entity similar to a beast.
4. •
   (no longer used) An animal-like instinct or behaviour.
5. •
   (no longer used) A mark, trait, or emblem of a beast.
6. •
   (no longer used) A status of lower animal.