Skullcap

Part of speech: noun (n.)

1. A cap which fits the head closely; also, formerly, a headpiece of iron sewed inside of a cap for protection.

2. Any plant of the labiate genus Scutellaria, the calyx of whose flower appears, when inverted, like a helmet with the visor raised.

3. The Lophiomys. Mad-dog skullcap (Bot.), an American herb (Scetellaria lateriflora) formerly prescribed as a cure for hydrophobia.