the GNU version of the Collaborative International Dictionary of English
n. The back or upper part of the neck; the nape.
The Century Dictionary and Cyclopedia
The nape or upper hind part of the neck, next to the hind-head.
In entomology, the neck of the metanotum; the part of the thorax to which is joined the petiole of the abdomen.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the back side of the neck
Word Usage
"From the nose-root to the nucha over the head he measures 13 1/2 inches, and between upper ear-tips across and over the head 11 inches, which is so close to the eight-and ten-inch standard that he may be called mesocephalic."