What's the adjective for marginalia? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs margin, marginalize, marginate and marginalise which may be used as adjectives within certain contexts.
marginal
(not comparable) Of, relating to, or located at or near a margin or edge; also figurative usages of location and margin (edge).
(politics) Subject to a change in sitting member with only a small change in voting behaviour, this usually being inferred from the small winning margin of the previous election.
(economics) Pertaining to changes resulting from a unit increase in production or consumption of a good.
“Sharply marginated secondary lobules may be seen in infection and hemorrhage.”
“Bosniak II cysts are well marginated and characterized by a few thin septa less than 1 mm and thin calcifications.”
“Magnetic resonance imaging showed a 2.5-cm, smoothly marginated, ovoid mass that did not have the signal characteristics typical for benign adenoma or myelolipoma.”