Definition of liberty cap in US English:

liberty cap

noun

  • 1A common small European toadstool which has a grayish-brown cap with a distinct boss and a long, thin stem, containing the hallucinogen psilocybin.

    Psilocybe semilanceata, family Strophariaceae, class Hymenomycetes

  • 2

    another term for cap of liberty

Pronunciation

liberty cap

/ˈlibərdē kap/