The Collaborative International Dictionary of English v.0.48:

Pad \Pad\, v. t. [imp. & p. p. Padded; p. pr. & vb. n.
   Padding.]
   1. To stuff; to furnish with a pad or padding.
      [1913 Webster]

   2. (Calico Printing) To imbue uniformly with a mordant; as,
      to pad cloth. --Ure.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pad \Pad\, v. i.
   1. To travel heavily or slowly. --Bunyan.
      [1913 Webster]

   2. To rob on foot. [Obs.] --Cotton Mather.
      [1913 Webster]

   3. To wear a path by walking. [Prov. Eng.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pad \Pad\, n. [Perh. akin to pod.]
   1. A soft, or small, cushion; a mass of anything soft;
      stuffing.
      [1913 Webster]

   2. 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.
      [1913 Webster]

   3. A cushion used as a saddle without a tree or frame.
      [1913 Webster]

   4. A stuffed guard or protection; esp., one worn on the legs
      of horses to prevent bruising.
      [1913 Webster]

   5. (Zool.) A cushionlike thickening of the skin one the under
      side of the toes of animals.
      [1913 Webster]

   6. A floating leaf of a water lily or similar plant.
      [1913 Webster]

   7. (Med.) A soft bag or cushion to relieve pressure, support
      a part, etc.
      [1913 Webster]

   8. (Naut.) A piece of timber fixed on a beam to fit the curve
      of the deck. --W. C. Russel.
      [1913 Webster]

   9. A measure for fish; as, sixty mackerel go to a pad; a
      basket of soles. [Eng.] --Simmonds.
      [1913 Webster]

   10. A dwelling place, usually an apartment; one's living
       quarters; as, come over to my pad to watch the game.
       [Slang]
       [PJC]

   11. A sum of money paid as a bribe to police officers, shared
       among them; also, the list of such officers receiving
       such a bribe.
       [PJC]

   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.

   on the pad, receiving bribes; -- of police officers.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

pad \pad\ (p[a^]d), n. [D. pad. [root]21. See Path.]
   1. A footpath; a road. [Obs. or Prov. Eng.]
      [1913 Webster]

   2. An easy-paced horse; a padnag. --Addison
      [1913 Webster]

            An abbot on an ambling pad.           --Tennyson.
      [1913 Webster]

   3. A robber that infests the road on foot; a highwayman; --
      usually called a footpad. --Gay. --Byron.
      [1913 Webster]

   4. The act of robbing on the highway. [Obs.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pad \Pad\, v. t.
   To travel upon foot; to tread. [Obs.]
   [1913 Webster]

         Padding the streets for half a crown.    --Somerville.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pad
    n 1: a number of sheets of paper fastened together along one
         edge [syn: pad, pad of paper, tablet]
    2: the large floating leaf of an aquatic plant (as the water
       lily)
    3: a block of absorbent material saturated with ink; used to
       transfer ink evenly to a rubber stamp [syn: pad, inkpad,
       inking pad, stamp pad]
    4: a flat mass of soft material used for protection, stuffing,
       or comfort
    5: a platform from which rockets or space craft are launched
       [syn: launching pad, launchpad, launch pad, launch
       area, pad]
    6: temporary living quarters [syn: diggings, digs,
       domiciliation, lodgings, pad]
    7: the fleshy cushion-like underside of an animal's foot or of a
       human's finger
    v 1: add details to [syn: embroider, pad, lard,
         embellish, aggrandize, aggrandise, blow up,
         dramatize, dramatise]
    2: walk heavily and firmly, as when weary, or through mud;
       "Mules plodded in a circle around a grindstone" [syn: slog,
       footslog, plod, trudge, pad, tramp]
    3: line or stuff with soft material; "pad a bra" [syn: pad,
       fill out]
    4: add padding to; "pad the seat of the chair" [syn: pad,
       bolster]

Moby Thesaurus II by Grady Ward, 1.0:

423 Moby Thesaurus words for "pad":
   Domesday Book, abate, abiding place, abode, account book, address,
   address book, adversaria, aegis, air mattress, album, allay,
   alleviate, ambler, ambulate, anesthetize, ankle, annual, appease,
   appointment calendar, appointment schedule, arch, arm guard,
   assuage, backstop, barrier, battologize, bedding, benumb,
   blankbook, blotter, bolster, boss, brattice, brim, buffer,
   buffer state, bulkhead, bulwark, bump, bumper, calendar,
   cantonment, cashbook, catalog, ceil, charge, chatter, chink, chock,
   circumambulate, classified catalog, click, clink, cloison, clop,
   clubfoot, clump, clunk, cob, collision mat, colophon,
   commonplace book, concavity, congest, contraceptive, convexity,
   copyright, court calendar, cram, crash helmet, crash pad, crawl,
   creep, crib, crowd, crump, cushion, dactylogram, dactylograph,
   dashboard, daybook, deaden, deaden the pain, dent, desk calendar,
   diaphragm, diary, digit, diminish, dint, diptych, dissepiment,
   dividing line, dividing wall, division, docket, dodger, dog,
   domicile, domus, drag out, draw out, dull, dull thud, dwelling,
   dwelling place, ease, ease matters, embellish, embossment,
   engagement book, exaggerate, excrescence, extend, extremity, face,
   face mask, feather, fender, fetlock, fill, fill out,
   fill to overflowing, fill up, finger guard, fingerprint, flick,
   flump, foment, foot, foot guard, foot it, footmark, footprint,
   footstep, forefoot, forepaw, fossil footprint, freight, fudge, fur,
   fuse, gaited horse, galloper, give an encore, give relief,
   go on tiptoe, go over, go through, goggles, governor, grovel,
   guard, guardrail, gumshoe, habitation, hand guard, handrail,
   hard hat, harefoot, heel, helmet, high-stepper, hoof, hoof it,
   ichnite, ichnolite, impress, impression, imprint, inch, inch along,
   indent, indentation, indention, inlay, innerspring mattress,
   instep, insulation, interline, interlock, interseptum, iterate,
   jam, jam-pack, jaywalk, jog on, journal, knee guard, knuckle guard,
   lade, laminated glass, lay, ledger, leg, leg it, lessen,
   life preserver, lifeline, lightning conductor, lightning rod, line,
   litter, load, lodging, lodging place, lodgment, log, logbook,
   loose-leaf notebook, lull, lump, magnify, mask, mat, mattress,
   memo book, memorandum book, memory book, midriff, midsection,
   mitigate, mollify, mudguard, nest, never finish, nightwalk,
   nose guard, notebook, numb, overcharge, overdraw, overfill,
   overpaint, overstate, pace, pacer, pack, padding, padnag,
   palladium, pallet, palliate, panel, paries, partition, party wall,
   pastern, pat, patent, patte, patter, paw, paw print, pawmark,
   pedal extremity, pedes, pedestrianize, perambulate, peripateticate,
   perorate, pes, petty cashbook, pied, pillow, pilot, pimple,
   pitapat, pitter-patter, place, place to live, plump, plunk,
   pocket notebook, pocketbook, police blotter, pop, poultice,
   pour balm into, pour oil on, practice, prancer, preventive, print,
   property line, prophylactic, protection, protective clothing,
   protective umbrella, protract, prowl, pug, pugmark, pussyfoot,
   racker, ram in, rap, reaffirm, reassert, recapitulate, recite,
   recount, reduce, rehearse, reissue, reiterate, relieve, reprint,
   residence, restate, resume, retail, retell, review, reword, roof,
   rug, run out, run over, safeguard, safety, safety glass,
   safety plug, safety rail, safety shoes, safety switch,
   safety valve, salve, satiate, saturate, say over, say over again,
   scrabble, scramble, scrapbook, scratch pad, screen, seal, seat,
   seat belt, separation, septulum, septum, shield, shin guard,
   shock pad, shuffle along, side-wheeler, sidle, sigil, signet,
   single-footer, slacken, slake, sleeping bag, slink, snake, sneak,
   soften, sole, soothe, speak at length, spin out, spiral notebook,
   splayfoot, springs, stamp, steal, steal along, step, stepper,
   stretch, stretch out, stride, string out, stud, stuff, stump it,
   stupe, subdue, sum up, summarize, sun helmet, supercharge, surfeit,
   table, tablet, tap, tautologize, thud, thumbmark, thumbprint,
   thump, tick, tinkle, tippytoe, tiptoe, toe, tootsy, top off,
   traipse, tread, triptych, trotter, tunk, umbrella, underbed,
   underbedding, ungula, vestige, wad, wainscot, walk, wall, weight,
   windscreen, windshield, workbook, worm, worm along, writing tablet,
   yearbook



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PAD
       Packet Assembling Disassembling (CCITT, X.3, X.28, X.29, PSDN)


The Free On-line Dictionary of Computing (30 December 2018):

Packet Assembler/Disassembler
PAD

   (PAD) Hardware or software device for splitting a data stream
   into discrete packets for transmission over some medium and
   then reforming the stream(s) at the receiver.

   The term is most often used for interfaces to X.25 lines.

   (1995-01-31)