morrillo
/mɒˈrɪl(j)əʊ/ /mɒˈriːjəʊ/(also morillo, murillo) Bullfighting
noun
The muscle at the back of the bull's neck, one of the targets for the lances of the bullfighters.
Origin
1920s; earliest use found in Ernest Hemingway (1899–1961), writer. From Spanish morrillo fleshy part of the neck from morro + -illo, diminutive suffix.