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  • Webster's Revised Unabridged Dictionary
    • a Nuchal (Anat) Of, pertaining to, or in the region of, the back, or nape, of the neck; -- applied especially to the anterior median plate in the carapace of turtles.
    • ***
Century Dictionary and Cyclopedia
    • nuchal Of or pertaining to the nucha or nape: as, the nuchal muscles.
    • nuchal In entomology:
    • nuchal Situated superiorly, just behind the head: said especially of ornaments, processes, etc., on an insect-larva.
    • nuchal Of or pertaining to the metanotal nucha.
    • nuchal In the trilobites, relating to the axial segment and groove at the base of the cephalon.
    • n nuchal One of two or more plates forming part of the covering of the dorsal portion of the neck in reptiles. The term is usually applied to the well-marked bony plates of crocodiles but also, as in lizards, to horny plates or shields.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Nuchal nū′kal pertaining to the Nū′cha or nape.
    • ***


Webster's Revised Unabridged Dictionary
Cf. F. nucal,


In literature:

The pale nuchal area was a cream-color, and the iris was grayish red.
"The Amphibians and Reptiles of Michoacán, México" by William E. Duellman
The Leydigian or nuchal organ is supposed to be auditory and to contain an otolith.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6" by Various
The mid-dorsal light line bifurcates either on the nuchals or on the parietals.
"Life History and Ecology of the Five-lined Skink, Eumeces fasciatus" by Henry S. Fitch
The marginal rim is widest at the posterior end of the carapace and lacking in the nuchal area.
"North American Recent Soft-shelled Turtles (Family Trionychidae)" by Robert G. Webb