Webster's Revised Unabridged Dictionary · 1913

Insular

Insular , adjective

[Latin insularis, from insula island: compare French insulaire. See Isle.]

1.
Of or pertaining to an island; of the nature, or possessing the characteristics, of an island; as, an insular climate, fauna, etc.
2.
Of or pertaining to the people of an island; narrow; circumscribed; illiberal; contracted; as, insular habits, opinions, or prejudices.
The penury of insular conversation. — Johnson

Insular , noun

An islander. [Rare] — Berkeley