Wordnet 3.0
NOUN (1)
1. 
 (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts; 
- Example: "in anatomical structure prehistoric man shows close affinity with modern humans"[syn: affinity, phylogenetic relation]
WordNet (r) 3.0 (2006):
phylogenetic relation
    n 1: (biology) state of relationship between organisms or groups
         of organisms resulting in resemblance in structure or
         structural parts; "in anatomical structure prehistoric man
         shows close affinity with modern humans" [syn: affinity,
         phylogenetic relation]