-ēəm noun
( plural scho·lia -ēə ; also scholiums )
Etymology: New Latin scholium, from Greek scholion, diminutive of scholē lecture — more at school
1. : a marginal annotation : an explanatory remark or comment (as on the text of a classic by an early grammarian)
2. : a remark or observation subjoined but not essential to a demonstration or a train of reasoning
explanatory scholia inserted by the editors in the text of Euclid's Elements