[1] : The Collaborative International Dictionary of English v.0.48

paraph \par"aph\, n. f. paraphe, parafe, contr. fr.
   paragraphe.
   a flourish made with the pen at the end of a signature. in
   the middle ages, this formed a sort of rude safeguard against
   forgery. --brande  c.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

paraph \par"aph\, v. t. imp.  p. p. paraphed; p. pr.  vb.
   n. paraphing. cf. f. parapher, parafer.
   to add a paraph to; to sign, esp. with the initials.
   1913 webster
see also:
paraphed paraphing 

[3] : WordNet (r) 2.0

paraph
     n : a flourish added after or under your signature originally
         to protect against forgery

Paraph >> P Words
Paraph, definition of term: Paraph
paraph_pag1.html