Definition of "grammary"

She took a spell of grammary, and threw it on the knight: / Still he stood, and moved not: (I tell the tale aright:) / She took from him his falchion, unlac'd his hauberk bright. / Mournfully Wolfdietrich cried, "Gone is all my might. […]"

1814, “The Book of Heroes. Book Second. Of Hughdietrich, and His Son Wolfdietrich.”, in [Henry William Weber, Robert Jamieson, and Walter Scott], editors, Illustrations of Northern Antiquities, from the Earlier Teutonic and Scandinavian Romances; being an Abstract of the Book of Heroes, and Nibelungen Lay; with Translations of Metrical Tales, from the Old German, Danish, Swedish, and Icelandic Languages; with Notes and Dissertations, Edinburgh: Printed by James Ballantyne and Co. for Longman, Hurst, Rees, Orme, and Brown, London; and John Ballantyne and Co., Edinburgh, adventure IX, page 80

Tall at times his stature grew, with spells of grammary; / Then to the noblest princes fellow might he be: / And when he rode, a noble blade bore he in his hand; / In many fights the sword was proved worth a spacious land.

1814, “The Book of Heroes. Book Fourth. Of the Little Garden of Roses, and of Laurin, King of the Dwarfs.”, in [Henry William Weber, Robert Jamieson, and Walter Scott], editors, Illustrations of Northern Antiquities, from the Earlier Teutonic and Scandinavian Romances; being an Abstract of the Book of Heroes, and Nibelungen Lay; with Translations of Metrical Tales, from the Old German, Danish, Swedish, and Icelandic Languages; with Notes and Dissertations, Edinburgh: Printed by James Ballantyne and Co. for Longman, Hurst, Rees, Orme, and Brown, London; and John Ballantyne and Co., Edinburgh, page 153