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Longman Dictionary of Contemporary English
skull cap
noun
EXAMPLES FROM CORPUS
▪ His close-cropped hair was hidden under a black velvet skull cap.
▪ I recognized the neat plastic skull cap.
▪ It is a Walkman-sized device wired to a skull cap that monitors brain waves.
▪ The pale woman, bosom exposed, is entwined with a dark man wearing a sullen expression and a skull cap.
Wiktionary
skull cap

n. (alternative spelling of skullcap English)

Usage examples of "skull cap".

In this case they'll have an open coffin and a lengthy wake, and you can't prevent brain material leaking onto the pillow, so we stuff the skull with Huggies or whatever we have and close it back up, and I put a notch in the skull cap over both ears, so it won't slide.

In a few weeks his head would be in clamps, his body paralyzed, the skull cap removed, his brains exposed and sprouting electrodes to monitor his death.

We've found a total of fifty-three whole skeletons and perhaps seventy partials, a bit of femur or skull cap or tooth here and there.

McNichol seemed to be cleaning up, replacing the skull cap and chest plate, and wiping the body with blue cloth.

What she brought away from her head was not the familiar skull cap made to fit over her cropped hair.