plural
Word Origin early 19th century: from modern Latin, neuter plural of marginalis, from margo, margin- (see margin).
Scrabble Points: 13
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Handwritten notes and illustrations in margins of book pages
Marginalia are marks made in the margins of a book or other document. They may be scribbles, comments, glosses (annotations), critiques, doodles, drolleries, or illuminations. Wikipedia