"skullcap" in the noun sense
1. skullcap
rounded brimless cap fitting the crown of the head
2. skullcap, helmetflower
a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised
3. calvaria, skullcap
the dome of the skull
Source: WordNet® (An amazing lexical database of English)
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