• The storm petrel. • The gannet. • See Cornish chough, under Chough. • The common tern.
any of certain coastal tern species. See tern.
Sea' swal'low 1. (Zoology) (a) The common tern. (b) The storm petrel. (c) The gannet. 2. (Her.) See Cornish chough , under Chough . 
Sea swallow is a popular name for the Euoropean little tern (Sterna minuta).
[n] - common tern of Eurasia and America having white black and gray plumage
Sterna hirundo noun common tern of Eurasia and America having white black and grey plumage