The Collaborative International Dictionary of English v.0.48:

Pilewort \Pile"wort`\, n. (Bot.)
   A plant (Ranunculus Ficaria of Linn[ae]us) whose tuberous
   roots have been used in poultices as a specific for the
   piles. --Forsyth.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Celandine \Cel"an*dine\ (s[e^]l"[a^]n*d[imac]n), n. [OE.
   celidoine, OF. celidoine, F. ch['e]lidoine, fr. L. chelidonia
   (sc. herba), fr. chelidonius pertaining to the swallow, Gr.
   chelido`nios, fr. chelidw`n the swallow, akin to L. hirundo a
   swallow.] (Bot.)
   A perennial herbaceous plant (Chelidonium majus) of the
   poppy family, with yellow flowers. It is used as a medicine
   in jaundice, etc., and its acrid saffron-colored juice is
   used to cure warts and the itch; -- called also greater
   celandine and swallowwort.
   [1913 Webster]

   Lasser celandine, the pilewort (Ranunculus Ficaria).
      [1913 Webster]

WordNet (r) 3.0 (2006):

Ranunculus ficaria
    n 1: perennial herb native to Europe but naturalized elsewhere
         having heart-shaped leaves and yellow flowers resembling
         buttercups; its tuberous roots have been used as a poultice
         to relieve piles [syn: lesser celandine, pilewort,
         Ranunculus ficaria]