smut

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Related to wheat smut: wheat rust

smut

(smŭt),
A fungal disease of cereal grains caused by species of Ustilago and characterized by dark brown or black masses of spores on the plants; for example, corn smut (U. maydis); loose smut of wheat (U. nuda)

smut

(1) Obscenity—i.e., lewd language or conversation.
(2) Pornography, see there.