Deipnosophist is a noun that refers to a person skilled at dinner talk. 

The Greek word for ‘meal’ provides the prefix D-E-I-P-N-O of our word of the day, while the suffix S-O-P-H-I-S-T comes from the Greek word for ‘wisdom.’ Here’s an example of it in use:

My son has become something of a deipnosophist at the dinner table lately. He can discuss a wide range of topics, but his favorite thing to talk about at the table is what he wants for dessert.