All 8 Uses

medieval
in
Artemis Fowl
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The centrepiece of the Fowl estate was a renovated late-medieval/earlymodern castle, built by Lord Hugh Fowl in the fifteenth century.†
Chpt 6
The only shelter was provided by the suits of medieval armour punctuating the walls.†
Chpt 8 *
Moving faster than Butler would have believed possible, the troll sprang across the lobby, brushing the medieval armour aside as though it were a shop mannequin.†
Chpt 8
The human, Butler, was strapping on a medieval suit of armour.†
Chpt 8
He danced under the tusks, hammering home a devastating uppercut with his medieval weapon.†
Chpt 8
As predicted, it swooped through the decimated doorway without knocking so much as a sliver of stone from the medieval walls.†
Chpt 9
Behind those medieval walls lay the bodies of a million insects, and under its floors the cooling corpses of spiders and mice.†
Chpt 9
Half a millennium's bad drainage from the medieval walls had transformed the foundations into a virtual bog.†
Chpt 9

Definitions:

(1) (medieval)
relating to or belonging to the Middle Ages

(the period of European history between the fall of the Roman Empire and the beginning of the Renaissance -- roughly 500–1500 AD)

Often thought of as a time of instability, superstition, plagues, feudal lords, and knighthood.
(2) (meaning too rare to warrant focus)
Much more rarely, medieval may be used to refer to something as old-fashioned and unenlightened.