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, especially those of the genus Sterna, as S. hirundo(common tern) of Eurasia and America, having white, black, and gray plumage.
Origin: 1670–80; < Danishterne or Norwegianterna; cognate with Old Norsetherna
any aquatic bird of the subfamily Sterninae, having a forked tail, long narrow wings, a pointed bill, and a typically black-and-white plumage: family Laridae (gulls, etc), order Charadriiformes
[C18: from Old Norse therna; related to Norwegian terna, Swedish tärna]
tern2 (tɜːn)
—n
1.
a three-masted schooner
2.
rare a group of three
[C14: from Old French terne, from Italian terno, from Latin ternī three each; related to Latin ter thrice, trēs three]
gull-like shore bird (subfamily Sterninae), 1678, via E.Anglian dialect, from a Scand. source (cf. Dan. terne, Swed. tärna, Færoese terna) related to O.N. þerna "tern," cognate with O.E. stearn "starling."