A person or thing that dams; something that builds or maintains a dam, or a device that blocks or restricts flow.
From 'dam' combined with the agent suffix -er, meaning 'one who does' or 'thing that does.' This standard English word formation creates an agent noun.
Beavers are nature's master dammers—they can fell trees and construct engineered dams without any formal training, which is why ecologists now recognize them as 'ecosystem engineers' that reshape entire landscapes!
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