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acervulus (n.)

"brain-sand" (anatomical), 1806, medical Latin, literally "little heap," diminutive of Latin acervus "heap," which is akin to acer "sharp" (from PIE root *ak- "be sharp, rise (out) to a point, pierce").

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Definitions of acervulus from WordNet

acervulus (n.)
small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi;
From wordnet.princeton.edu