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Definition of æcidium
1. Noun. (botany) The cupulate fruiting body borne upon the mycelium of certain fungi commonly parasitic upon specimina of the ''Compositæ'', ''Labiatæ'', ''Leguminosæ'', and ''Ranunculaceæ'' families ¹
2. Noun. (mycology) A member of the form genus ''Aecidium''. ¹
¹ Source: wiktionary.com