auchenium

Century Dictionary and Cyclopedia

1. n. In ornithology, the lower back part of the neck; the scruff of the neck, just below the nape. Illiger; Sundevall.

Wiktionary

1. n. zoology The posterior portion of the neck in birds.

GNU Webster's 1913

1. n. (Zoöl.) The part of the neck nearest the back.