The Collaborative International Dictionary of English v.0.48:

Pill \Pill\, n. [F. pilute, L. pilula a pill, little ball, dim.
   of L. pila a ball. Cf. Piles.]
   1. A medicine in the form of a little ball, or small round
      mass, to be swallowed whole.
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   2. Figuratively, something offensive or nauseous which must
      be accepted or endured. --Udall.
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   Pill beetle (Zool.), any small beetle of the genus
      Byrrhus, having a rounded body, with the head concealed
      beneath the thorax.

   Pill bug (Zool.), any terrestrial isopod of the genus
      Armadillo, having the habit of rolling itself into a
      ball when disturbed. Called also pill wood louse.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pill \Pill\, n. [Cf. Peel skin, or Pillion.]
   The peel or skin. [Obs.] "Some be covered over with crusts,
   or hard pills, as the locusts." --Holland.
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The Collaborative International Dictionary of English v.0.48:

Pill \Pill\, v. i.
   To be peeled; to peel off in flakes.
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The Collaborative International Dictionary of English v.0.48:

Pill \Pill\, v. t. [Cf. L. pilare to deprive of hair, and E.
   pill, n. (above).]
   1. To deprive of hair; to make bald. [Obs.]
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   2. To peel; to make by removing the skin.
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            [Jacob] pilled white streaks . . . in the rods.
                                                  --Gen. xxx.
                                                  37.
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The Collaborative International Dictionary of English v.0.48:

Pill \Pill\, v. t. & i. [imp. & p. p. Pilled; p. pr. & vb. n.
   Pilling.] [F. piller, L. pilare; cf. It. pigliare to take.
   Cf. Peel to plunder.]
   To rob; to plunder; to pillage; to peel. See Peel, to
   plunder. [Obs.] --Spenser.
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         Pillers and robbers were come in to the field to pill
         and to rob.                              --Sir T.
                                                  Malroy.
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WordNet (r) 3.0 (2006):

pill
    n 1: something that resembles a tablet of medicine in shape or
         size
    2: a dose of medicine in the form of a small pellet [syn:
       pill, lozenge, tablet, tab]
    3: a unpleasant or tiresome person
    4: something unpleasant or offensive that must be tolerated or
       endured; "his competitor's success was a bitter pill to take"
    5: a contraceptive in the form of a pill containing estrogen and
       progestin to inhibit ovulation and so prevent conception
       [syn: pill, birth control pill, contraceptive pill,
       oral contraceptive pill, oral contraceptive, anovulatory
       drug, anovulant]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "pill":
   IUD, SOB, bag, bastard, birth control device, bolus, bore, bugger,
   butt, buttonholer, capsule, condom, contraceptive,
   contraceptive foam, cough drop, crank, crashing bore, creep, cure,
   diaphragm, drag, drip, drug, dryasdust, dusty, fag, fart,
   flat tire, frightful bore, headache, heel, hood, hooligan, humdrum,
   intrauterine device, jerk, louse, lozenge, meanie, medicament,
   medication, medicine, mother, nuisance, oral contraceptive,
   pastille, pellet, pessary, pest, pharmaceutical, prophylactic,
   proser, rat, remedy, rubber, shit, shithead, shitheel, skin, smoke,
   spermicidal jelly, spermicide, stinkard, stinker, tablet, the pill,
   troche, turd, twaddler, wet blanket