[1] : 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.
      1913 webster

   2. figuratively, something offensive or nauseous which must
      be accepted or endured. --udall.
      1913 webster

   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
see also:
piles pill beetle byrrhus pill bug armadillo pill wood louse 

[2] : WordNet (r) 2.0

pill bug
     n : small terrestrial isopod with a convex segmented body that
         can roll up into a ball

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