Definition of "falx"

(historical) A short Dacian sword resembling a sickle.

Any sickle-shaped part or process.

1. (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.  examples

2. (anatomy, dated) A chelicera.  examples

3. (anatomy) A snake's poison fang.  examples

4. (anatomy) A rotula of a sea urchin.  examples