Noun, pl. plural falxes or falces
1. A Latin word originally meaning sickle, but was later used to mean any of a number of tools that had a curved blade that was sharp on the inside edge such as a scythe. Falx was also used to mean a weapon, particularly that of the Thracians and Dacians, and later a siege hook used by the Romans themselves. (wikipedia.org)
2. (Anatomy)
A curved fold or process of the dura mater or the peritoneum; especially, one of the partition like folds of the dura mater which extend into the great fissures of the brain. (biology-online.org)