Falx n. : A curved fold or process of the dura mater or the peritoneum; esp., one of the partitionlike folds of the dura mater which extend into the great fissures of the brain.

Example:
What is calcification of the anterior Falx cerebri?

Taxonomy
falx, Dacian, shields, weapon, Tropaeum Traiani, romphaia, falx cerebri, falx cerebelli, inguinal aponeurotic falx, Dacians, Thracian, free encyclopedia, scythe, warriors, frieze, Dacian wars, sickle, Battle of Adamclisi.

Defination from the web:
falx supina by Juvenal in Satiriae. ... It may be imagined that the length of the two-handed falx allowed it to be wielded with great force, the point piercing helmets and the blade ...