Wiktionary
n. A very long dining table mostly used in institutions
WordNet
n. a long narrow dining table supported by a stretcher between two trestles
Wikipedia
A refectory table is a highly elongated table used originally for dining in monasteries in Medieval times. In the Late Middle Ages the table gradually became a banqueting or feasting table in castles and other noble residences. The original table manufacture was by hand and created of oak or walnut; the design is based on a trestle-style. Typically the table legs are supported by circumferential stretchers positioned very low to the floor.
Usage examples of "refectory table".
And hadn't it begun just after he ran his finger down the page of one of the books that lay open on the refectory table in the Abbey of Warm Current?
Nannie Slagg had on a few occasions sat there, furtively knitting with her paper bag of wool on the long refectory table in the centre, and the high back of the carved chair towering over her.
And when Esther came out of her room for lunch there was a short interval of time when she and Jubal had the big refectory table practically to themselves, and he had a chance to talk to her.
She took him to her with an air of Christian charity, and he took her, there, openly, on the refectory table.
The long refectory table that spanned the length of the near wall was littered with fluted glass tubes, boxes, and cloth sacks of powders and pungent salts, as well as intricate structures of wood and metal from which depended retorts and phials and other unrecognizable containers.
The boy and girl were seated at the refectory table going over graphs and contracts.
He had not, until that moment, realised that he had a stool, and a large, solid stool, too, with a top to it as thick as a refectory table.
Skeleton stole away from whatever he had been doing at the back of the stage and took a chair fifteen feet from the hall door, to one side of the refectory table.