from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The study or description of the arrangement of feathers, or of the pterylae, of birds.
from the GNU version of the Collaborative International Dictionary of English
- n. The study or description of the arrangement of feathers, or of the pterylæ, of birds.
from The Century Dictionary and Cyclopedia
- n. The description of pterylæ, or a treatise on pterylosis: a science which had its origin in the “System der Pterylographie” of Nitzsch, 1833-40.
Sorry, no etymologies found.
They also share details of pterylography and soft tissue and skeletal anatomy, plus they’re generally alike in behaviour and ecology.