What does "pad" mean?

Additional senses

1. 2.A robber that infests the road on foot; a highwayman; -- usually called a footpad. Gay. Byron.
2. 3.The act of robbing on the highway. [Obs.]
3. 4.To travel upon foot; to tread. [Obs.] Padding the streets for half a crown. Somerville.
4. 5.To travel heavily or slowly. Bunyan.
5. 6.To rob on foot. [Obs.] Cotton Mather.
6. 7.To wear a path by walking. [Prov. Eng.]
7. 8.A soft, or small, cushion; a mass of anything soft; stuffing.
8. 9.A kind of cushion for writing upon, or for blotting; esp., one formed of many flat sheets of writing paper, or layers of blotting paper; a block of paper.
9. 10.A cushion used as a saddle without a tree or frame.
10. 11.A stuffed guard or protection; esp., one worn on the legs of horses to prevent bruising.
11. 12.(Zoöl.) A cushionlike thickening of the skin one the under side of the toes of animals.
12. 13.A floating leaf of a water lily or similar plant.
13. 14.(Med.) A soft bag or cushion to relieve pressure, support a part, etc.
14. 15.(Naut.) A piece of timber fixed on a beam to fit the curve of the deck. W. C. Russel.
15. 16.A measure for fish; as, sixty mackerel go to a pad; a basket of soles. [Eng.] Simmonds. Pad cloth, a saddlecloth; a housing. -- Pad saddle. See def. 3, above. -- Pad tree (Harness Making), a piece of wood or metal which gives rigidity and shape to a harness pad. Knight.
16. 17.To stuff; to furnish with a pad or padding.
17. 18.(Calico Printing) To imbue uniformly with a mordant; as, to pad cloth. Ure.