What does "green-winged" mean in ornithology?

The term "green-winged" is not commonly used in English. However, based on the context of your question, I assume you are asking about the meaning of "green-winged" in relation to birds.

In ornithology, "green-winged" is an adjectival phrase used to describe certain species of birds that have a distinctive green coloration on their wings. The exact meaning of the term can vary depending on the specific species being described, but it generally refers to birds that have a predominantly greenish hue on their wing feathers.

For example, the Green-winged Teal (Anas crecca) is a species of duck that has a distinctive green coloration on its wings, which gives it its name. Similarly, the Green-winged Warbler (Phylloscopus chloronotus) is a species of warbler that has a greenish tint on its wings.

In summary, "green-winged" is an adjectival phrase used to describe birds that have a predominantly green coloration on their wings.