skullcap

UK: /ˈskʌlkæp/ US: /ˈskʌlˌkæp/ ,(skul′kap′)

WordReference Random House Learner's Dictionary of American English © 2026

skull•cap /ˈskʌlˌkæp/   n. [countable]

1. Clothing a small, brimless, close-fitting cap, often made of silk or velvet, worn on the crown of the head.
2. yarmulke.

WordReference Random House Unabridged Dictionary of American English © 2026

skull•cap  (skul′kap′), n. 

1. Clothing, Judaism a small, brimless close-fitting cap, often made of silk or velvet, worn on the crown of the head, as for religious functions.
2. the domelike roof of the skull.
3. Plant Biology [Bot.] any of various plants belonging to the genus Scutellaria, of the mint family, having a calyx resembling a helmet.

• skull + cap¹ 1675–85

Collins Concise English Dictionary © HarperCollins Publishers::

skullcap / ˈskʌlˌkæp/ noun

1. a rounded brimless hat fitting the crown of the head
2. the nontechnical name for calvaria
3. any of various perennial plants of the genus Scutellaria, esp S. galericulata, that typically have helmet-shaped flowers: family Lamiaceae (labiates)