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

Examples

• The overstory blocked most of the sunlight from reaching the forest floor.
• Tall oak and maple trees formed the overstory of the deciduous forest.
• Birds nested in the overstory where they could find safety from ground predators.
• The hurricane damaged much of the overstory, leaving gaps in the forest canopy.
• Scientists studied the overstory to understand how trees compete for light.
• The overstory provides habitat for many species of birds and insects.