nosing

noun3

1. •
   An animal's pushing or exploration with the nose.

   • The hours of the day often follow such a beginning like a wagging tail follows through the nosings and affections and fireside dreamings of a happy dog. — 1982
2. •
   That part of the treadboard of a stair that projects over the riser.
3. •
   Any similar projection, such as the projecting edge of a moulding.