Millions of chickens had to be killed due to the ____ flu this year.

adjective

1. Of, relating to, or derived from birds

   "avian behavior"

2. of, relating to, or derived from birds

noun

1. A bird when considered as the survivor of a lineage of theropod dinosaurs

   "… thanks to a heap of lovely fossils, we now know that even the most fearsome of the tyrant dinosaurs were closely related to the avian dinosaurs—the birds that flit around our backyards today."

2. a bird when considered as the survivor of a lineage of theropod dinosaurs

noun

1. Highly variable influenza A of birds caused by any of the subtypes of the causative orthomyxovirus of which some strains have been or may be transmitted to other vertebrates including humans especially after undergoing mutation
2. highly variable influenza A of birds caused by any of the subtypes of the causative orthomyxovirus of which some strains have been or may be transmitted to other vertebrates including humans especially after undergoing mutation —called also avian flu

adjective

1. Not of or relating to birds not avian

   "… assorted nonavian creatures whirring, buzzing and croaking."

2. Of, relating to, or being a non-avian dinosaur

   "non-avian theropods"

noun

1. Any dinosaur that is not a bird

   "These new data show that certain non-avian dinosaurs and early birds shed their skin in ways very similar to that of modern birds and mammals."

2. any dinosaur that is not a bird