neuropil

Probably an abbreviation of obsolete neuropilema, from Ancient Greek νεῦρον (neûron, “nerve”) + πίλημα (pílēma, “felt”);[1] or neuro- +‎ Ancient Greek πῖλος (pîlos, “hair”).[2]

neuropil (plural neuropils)

1. A fibrous network of nervous tissue that forms the gray matter of the brain

• neuropile
• neuropilema

• neuropilar