Nestor:
(also ‘nestor’ without a capital ‘N’; plural: ‘nestors‘; for the right pronunciation of this word, please click here)
a wise old man;
an advise-giver,
(from a character worshipped as a hero and wise man giving advice to the Greek army at war with Troy in Greek mythology — when the Greeks were at war with Trojans over the beautiful queen, Helen)

the local nestor, the wise man who knows a lot about the customs, laws, religion and traditions of the community
When you are in doubt of any social custom, go to Mr Smith, our local Nestor/nestor.
Hey, nestor, can you tell me what neo-Nazi means? (i.e. calling somebody jovially or to mock that he/she is taken as a wise person)
It’s interesting to learn that in the Washington DC area, a nestor is slow driver who takes up a position in the left lane of a highway and drives below the speed limit, causing great annoyance to the drivers behind.
The more the cultural nestors in a community, the more the harm done to the culture and traditions of that community because each ‘nestor’, to counter his rival nestor, comes up with a more convincing explanation to a controversial custom or tradition and in doing so confuses the common folks altogether.
Note 2: ‘Nestor’ is a name given to a group birds, genus Nestor. For an interesting article about a kind of Nestor bird, please click here.

