Falx may refer to: Falciform ligament, a ligament of the liver Falx, a sickle, scythe or sickle-like weapon used by Dacians Falx cerebelli and falx cerebri, two parts of the dura mater of the brain Foramen ovale (heart), a fetal cardiac shunt, also called the falx septi Nu Persei Conjoint tendon, a sickle-shaped tendon of the transversus abdominis muscle, also called the inguinal aponeurotic falx Chelicerae, mouthparts of certain arthropods