1. a type of tree or shrub that grows in wet areas and belongs to the birch family

Examples

• The alder trees grew thick along the riverbank.
• We spotted several species of birds nesting in the alder grove.
• The wet soil near the marsh was perfect for alder growth.
• Alder wood is often used for smoking fish.
• The leaves of the alder tree turn yellow in autumn.
• Beavers had gnawed through several young alder saplings.