Bot. Pl. -a. [mod. L., dim. of Gr. αἰκία injury.] The cup-shaped fruit borne on the mycelium of certain parasitic fungi which especially attack the orders Compositæ, Ranunculacæ, Leguminosæ, and Labiatæ.
1867. J. Hogg, Microsc., II. i. 291. Producing chains of orange coloured fruit or in other words an Æcidium.
1878. M‘Nab, Bot., 56. The mycelium gives rise to small fruit-like bodies, the Æcidia.
