What is a refractory table?

A refractory table has leaves at ends, not in center....Expandable.

The correct name is a refectory (dining hall) table. The answer is basically correct for that term. Refractory describes heat resistant and/or insulating materials used in kilns, furnaces, wood stoves, etc (e.g. refractory brick). I suppose you could make a table out of firebrick.