Wordnet 3.0
NOUN (1)
1. 
 a natural father or mother; 
The Collaborative International Dictionary of English v.0.48:
Genitor \Gen"i*tor\, n. [L.]
   1. One who begets; a generator; an originator. --Sheldon.
      [1913 Webster]
   2. pl. The genitals. [Obs.] --Holland.
      [1913 Webster]
WordNet (r) 3.0 (2006):
genitor
    n 1: a natural father or mother
Moby Thesaurus II by Grady Ward, 1.0:
18 Moby Thesaurus words for "genitor":
   abba, dad, daddy, father, foster father, governor, pa, pap, papa,
   pappy, pater, paterfamilias, patriarch, pop, pops, sire,
   stepfather, the old man