Nuchal
Referring to the back of the neck (nape). For example, nuchal rigidity is a stiff neck, sometimes a symptom of meningitis. From the Latin "nucha" meaning nape. Pronounced "nu·kal" with the accent on the first syllable.
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nu·chal 'n(y)ü-kəl adj of, relating to, or lying in the region of the nape
Medical dictionary.
2011.