Wiktionary
maternal cousin
n. 1 A child of one's mother's sibling 2 A more distant relative of one's mother who is not a direct ancestor
Usage examples of "maternal cousin".
One had been a maternal cousin, whom Chee had suspected of hiring him only as an act of family kindness.
A maternal cousin of Selar's, Eachern had followed him into the first battles of the conquest, distinguishing himself on the field as a ruthless and bloodthirsty warrior.