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The acronym SEAL in the United States Navy SEALs stands for Sea, Air, and Land. It is derived from the teams' ability to operate on the seas, in the air, and on land.
Definition of seal for Students 1: a sea mammal that swims with flippers, lives mostly in cold regions, bears young on land, feeds on fish and other sea animals (as squid), and is sometimes hunted for its fur, hide, or oil