Longiroster \Lon`gi*ros"ter\, n.; pl. L. {Longirostres}, E. {Longirosters}. [L. longus long + rostrum beak: cf. F. longirostre.] (Zo["o]l.) One of the Longirostres. Longirostres \Lon`gi*ros"tres\, n. pl. [NL., fr. L. longus long + rostrum beak.] (Zo["o]l.) A group of birds characterized by having long slender bills, as the sandpipers, curlews, and ibises. It is now regarded as an artificial division.