As a noun acervulus is
calcified concretions near the pineal gland; brain sand.
pycinidium
Not English
Pycinidium has no English definition. It may be misspelled.
English words similar to 'pycinidium':
pycnidium
acervulus
English
Noun
(acervuli) (More fully : acervulus cerebri)
calcified concretions near the pineal gland; brain sand