noun
: any of various small terns:
a. : either of two pure white terns constituting a genus ( Gygis ) and living in tropical seas
b. : a small white black-capped tern ( Sterna nereis ) of the Australian region
noun
: any of various small terns:
a. : either of two pure white terns constituting a genus ( Gygis ) and living in tropical seas
b. : a small white black-capped tern ( Sterna nereis ) of the Australian region
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012