Home›Browse›S›sooty ternsooty ternOur editors are putting together more complete content — check back in about 20 minutessooty ternsooty tern — nounnoun1. a seabird with mostly black upperparts and white underparts, found in tropical o1.nounDefinitiona seabird with mostly black upperparts and white underparts, found in tropical oceansExampleA sooty tern flew gracefully over the waves.