1. a semiaquatic mammal with webbed feet, dense fur, and a long tail, that feeds mainly on fish

Examples

• The otter dove into the river to catch a fish.
• We watched a family of otters playing on the riverbank.
• Sea otters float on their backs while eating shellfish.
• The otter’s thick fur keeps it warm in cold water.
• River otters are excellent swimmers and divers.
• The zoo’s otter exhibit is always popular with children.
• Otters use tools like rocks to crack open shells.