left ventricle: the chamber on the left side of the heart that receives arterial blood from the left atrium and pumps it into the aorta
ventricle: a chamber of the heart that receives blood from an atrium and pumps it to the arteries
thanksgiving: fourth Thursday in November in the United States; second Monday in October in Canada; commemorates a feast held in 1621 by the Pilgrims and the Wampanoag