• (a.) Having a lamellate bill, as ducks and geese.
Lam`el·li·ros'tral adjective [ Lamella + rostral : confer French lamellirostre .] (Zoology) Having a lamellate bill, as ducks and geese. 
lamellirostral, lamellirostrate Having a beak equipped with thin plates or lamellae for straining water and mud from food, as the ducks, geese, swans, and flamingos.