Webster's 1828 Dictionary
KNIGHT-ERRANT
n.[knight and L. errans, erro, to wander. ] A wandering knight; a knight who traveled in search of adventures, for the purpose of exhibiting military skill, prowess and generosity.
KNIGHT-ERRANTRY
n.The practice of wandering in quest of adventures; the manners of wandering knights.
Webster's 1913 Dictionary
KNIGHT-ERRANT
Knight "-er `rant, n.; pl. Knight-errants, or Knights-errant.
Defn: A wandering knight; a knight who traveled in search of adventures, for the purpose of exhibiting military skill, prowess, and generosity.
KNIGHT-ERRANTRY
Knight "-er `rant *ry, n.; pl. Knight-errantries (.
Defn: The character or actions of wandering knights; the practice of wandering in quest of adventures; chivalry; a quixotic or romantic adventure or scheme. The rigid guardian [i. e., conscience ] of a blameless heart Is weak with rank knight-erratries o'errun. Young.
The Wordsmith Dictionary