whisker jack whis·ker·jack uncommon noun 1. gray jay of northern North America with black-capped head and no crest; noted for boldness in thievery SynonymsCanada jaygray jaycamp robberwhisker jackPerisoreus canadensis Related words Broader terms jay Narrower terms Rocky Mountain jay Parts Perisoreus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
