Wordnet 3.0
NOUN (1)
1. 
 a more or less distant relative; 
 familiar enough to be greeted with a kiss; 
[syn: kissing cousin, kissing kin]
The Collaborative International Dictionary of English v.0.48:
kissing kin \kiss"ing kin`\
   Any relative more distant than the immediate family,
   sufficiently well acquainted to be greeted with a kiss, such
   as a kissing cousin.
   [PJC]
WordNet (r) 3.0 (2006):
kissing kin
    n 1: a more or less distant relative; familiar enough to be
         greeted with a kiss [syn: kissing cousin, kissing kin]