Wiktionary
metagrammar
n. A formal grammar that describes a set of possible grammars.
Usage examples of "metagrammar".
I doubt they even understand how they created the contaminated metagrammar that they transmitted back to us.
Bat droppings streaked the spines of some of the tomes and stained the floor white, but there was no significant damage -- so Imad browsed for an afternoon, taking in the chronicles and metagrammars and methodologies of the unknown librarian who, judging by the depth of dust, had been dead far longer than Lord Capeluche's apothecary.