claviceps : Idioms & Phrases
claviceps purpurea
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noun a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; source of medicinally important alkaloids and of lysergic acid
ergot.
WordNet
genus claviceps
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noun fungi parasitic upon the ovaries of various grasses
Claviceps.