1. the uppermost layer of foliage in a forest, formed by the crowns of the tallest trees
Usage: forestry; ecology

Examples

• The overstories of tropical rainforests can reach heights of over 150 feet.
• Birds often nest in the overstories where they are protected from ground predators.
• Sunlight filters down through the dense overstories to the forest floor below.
• The overstories provide habitat for many species of monkeys and other arboreal animals.
• Forest researchers study the overstories to understand canopy ecosystems.
• The overstories create a natural umbrella that shelters the plants growing beneath.