\Skull"cap`\, n.
1. A cap which fits the head closely; also, formerly, a
   headpiece of iron sewed inside of a cap for protection.
2. (Bot.) Any plant of the labiate genus {Scutellaria}, the
   calyx of whose flower appears, when inverted, like a
   helmet with the visor raised.
3. (Zo["o]l.) The Lophiomys.
{Mad-dog skullcap} (Bot.), an American herb ({Scetellaria
   lateriflora}) formerly prescribed as a cure for
   hydrophobia.