The Collaborative International Dictionary of English v.0.48:

Florin \Flor"in\, n. [F. florin, It. florino, orig., a
   Florentine coin, with a lily on it, fr. flore a flower, fr.
   L. flos. See Flower, and cf. Floren.]
   A silver coin of Florence, first struck in the twelfth
   century, and noted for its beauty. The name is given to
   different coins in different countries. The florin of
   England, first minted in 1849, is worth two shillings, or
   about 48 cents; the florin of the Netherlands, about 40
   cents; of Austria, about 36 cents.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Guilder \Guil"der\, n. [D. gulden, orig., golden. Cf. Golden.]
   A Dutch silver coin worth about forty cents; -- called also
   florin and gulden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

florin
    n 1: the basic unit of money in Suriname; equal to 100 cents
         [syn: guilder, gulden, florin]
    2: formerly the basic unit of money in the Netherlands; equal to
       100 cents [syn: guilder, gulden, florin, Dutch
       florin]