A deipnosophist is an expert in the art of dinner-table conversation, particularly if they have the knack of being interesting about unusual things.
Please note that it's conversation, and not a habit of lecturing, that makes someone a deipnospohist, for lecturing people is a terrible habit, especially at the dinner table, and quite likely to get you a face full of custard.
But even so...
...well, there are worse things than a face full of custard, aren't there.
photo by Kalki
Word To Use Today: deipnosophist. This word entered the English language in the 1650s. Deipnosophistēs was the title of a fifteen-volume work by Athenaeus, who lived in the second and third centuries BC. The work takes the form of very wide-ranging dinner-table conversations, and a great deal of what we know about Greek civilisation comes from Athenaeus's books. Deipno- means dinner in Greek, and sophistēs means knowledgeable in the arts of.
Although no one wants to be thought a sophist (that is someone who reasons cleverly but falsely) to be a deipnosophist would be really rather lovely.