-_ləs noun
( plural acervu·li -ˌlī, -ˌlē)
Etymology: New Latin, diminutive of Latin acervus heap
1. : a fungous fruiting body consisting of a compacted and often saucer-shaped mass of threads lacking a well-developed stromatic base and with the conidiophores not tufted — compare sporodochium
2. also acervulus cer·e·bri -ˈserəˌbrē, -brī : brain sand