What is the definition of "tern"

Question: What does the word 'tern' mean?

ANSWER according to Dictionary.com: "’Äěnoun
any of numerous aquatic birds of the subfamily Sterninae of the family Laridae, related to the gulls but usually having a more slender body and bill, smaller feet, a long, deeply forked tail, and a more graceful flight, esp. those of the genus Sterna, as S. hirundo (common tern), of Eurasia and America, having white, black, and gray plumage."

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