SCHOLIUM

scholium, scholia

(noun) a marginal note written by a scholiast (a commentator on ancient or classical literature)

Source: WordNet® 3.1

Etymology

Noun

scholium (plural scholiums or scholia)

a note added to a text as an explanation, criticism or commentary

(mathematics) a note added to a proof as amplification

Source: Wiktionary

Scho"li*um, n.; pl. L. Scholia, E. Scholiums. Etym: [NL., fr. Gr. School.]

1. Marginal anotation; an explanatory remark or comment; specifically, an explanatory comment on the text of a classic author by an early grammarian.

2. A remark or observation subjoined to a demonstration or a train of reasoning.

Source: Webster’s Unabridged Dictionary 1913 Edition