http://dictionary.reference.com/browse/patronymic patronymic
[pa-truh-nim-ik]
Spell Syllables
Examples Word Origin
adjective
1. (of family names) derived from the name of a father or ancestor, especially by the addition of a suffix or prefix indicating descent.
2. (of a suffix or prefix) indicating descent.
noun
3. a patronymic name, as Williamson (son of William) or Macdonald (son of Donald).
4. a family name; surname.