One of the mysteries of the English language finally explained.
1Anatomy. More fully "acervulus cerebri": a collection of small calcified concretions situated within or near the pineal body; = brain sand. In later use also: an individual concretion of this kind.
2Mycology. In certain fungi pathogenic to plants: a flat, typically round mass of hyphae bearing conidiophores which is produced below the epidermis of the host plant.
Late 18th century. Originally from post-classical Latin acervulus (in acervulus cerebri from acervulus small heap or collection + classical Latin cerebrī, genitive singular of cerebrum).
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